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HOMESERVICE MANUALSTOYOTA2009YARIS S, 4D HATCHBACKREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEM (1NZ-FE)SFI SYSTEMDIAGNOSTIC TROUBLE CODE CHART
2009 Toyota Yaris S, 4D Hatchback

Diagnostic Trouble Code Chart

2009 Toyota Yaris S, 4D HatchbackSECTION Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART

DTC Code Detection Item Trouble Areas MIL Memory DTC for Mexico Models
P0010  Camshaft Position "A" Actuator Circuit (Bank 1)
  • Open or short in Oil Control Valve (OCV) circuit
  • OCV
  • ECM
 Comes on DTC stored Applies
P0011  Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)
  • Valve timing
  • Oil Control Valve (OCV)
  • OCV filter
  • Camshaft timing gear assembly
  • ECM
 Comes on DTC stored Applies
P0012  Camshaft Position "A" - Timing Over-Retarded (Bank 1)
  • Same as DTC P0011
 Comes on DTC stored Applies
P0016  Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
  • Mechanical system (Timing chain has jumped tooth or chain stretched)
  • Oil Control Valve (OCV)
  • OCV filter
  • Camshaft timing gear assembly
  • ECM
 Comes on DTC stored Applies
P0031  Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
  • Open in Air-Fuel Ratio (A/F) sensor heater circuit
  • A/F sensor heater (sensor 1)
  • Integration relay (EFI relay)
  • ECM
 Comes on DTC stored Applies
P0032  Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1)
  • Short in Air-Fuel Ratio (A/F) sensor heater circuit
  • A/F sensor heater (sensor 1)
  • Integration relay (EFI relay)
  • ECM
 Comes on DTC stored Applies
P0037  Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)
  • Open in Heated Oxygen (HO2) sensor heater circuit
  • HO2 sensor heater (sensor 2)
  • Integration relay (EFI relay)
  • ECM
 Comes on DTC stored Applies
P0038  Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)
  • Short in Heated Oxygen (HO2) sensor heater circuit
  • HO2 sensor heater (sensor 2)
  • Integration relay (EFI relay)
  • ECM
 Comes on DTC stored Applies
P0100  Mass or Volume Air Flow Circuit
  • Open or short in Mass Air Flow (MAF) meter circuit
  • MAF meter
  • ECM
 Comes on DTC stored Applies
P0101  Mass Air Flow Circuit Range/Performance Problem
  • Mass Air Flow (MAF) meter
  • Air induction system
  • PCV hose connections
 Comes on DTC stored -
P0102  Mass or Volume Air Flow Circuit Low Input
  • Open or short in Mass Air Flow (MAF) meter circuit
  • MAF meter
  • ECM
 Comes on DTC stored Applies
P0103  Mass or Volume Air Flow Circuit High Input
  • Open or short in Mass Air Flow (MAF) meter circuit
  • MAF meter
  • ECM
 Comes on DTC stored Applies
P0110  Intake Air Temperature Circuit Malfunction
  • Open or short in Intake Air Temperature (IAT) sensor circuit
  • IAT sensor (built into MAF meter)
  • ECM
 Comes on DTC stored Applies
P0111  Intake Air Temperature Sensor Gradient Too High
  • Intake air temperature sensor (built into mass air flow meter)
 Comes on DTC stored -
P0112  Intake Air Temperature Circuit Low Input
  • Short in Intake Air Temperature (IAT) sensor circuit
  • IAT sensor (built into MAF meter)
  • ECM
 Comes on DTC stored Applies
P0113  Intake Air Temperature Circuit High Input
  • Open in Intake Air Temperature (IAT) sensor circuit
  • IAT sensor (built into MAF meter)
  • ECM
 Comes on DTC stored Applies
P0115  Engine Coolant Temperature Circuit Malfunction
  • Open or short in Engine Coolant Temperature (ECT) sensor circuit
  • ECT sensor
  • ECM
 Comes on DTC stored Applies
P0116  Engine Coolant Temperature Circuit Range/Performance Problem
  • Thermostat
  • Engine Coolant Temperature (ECT) sensor
 Comes on DTC stored -
P0117  Engine Coolant Temperature Circuit Low Input
  • Short in Engine Coolant Temperature (ECT) sensor circuit
  • ECT sensor
  • ECM
 Comes on DTC stored Applies
P0118  Engine Coolant Temperature Circuit High Input
  • Open in Engine Coolant Temperature (ECT) sensor circuit
  • ECT sensor
  • ECM
 Comes on DTC stored Applies
P011B  Engine Coolant Temperature/Intake Air Temperature Correlation
  • Engine Coolant Temperature (ECT) sensor
  • Intake Air Temperature (IAT) sensor (built into MAF meter)
  • ECM
 Comes on DTC stored -
P0120  Throttle/Pedal Position Sensor/Switch "A" Circuit Malfunction
  • Throttle Position (TP) sensor (built into throttle body)
  • ECM
 Comes on DTC stored Applies
P0121  Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem
  • Throttle Position (TP) sensor (built into throttle body)
 Comes on DTC stored Applies
P0122  Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input
  • Throttle Position (TP) sensor (built into throttle body)
  • Short in VTA1 circuit
  • Open in VC circuit
  • ECM
 Comes on DTC stored Applies
P0123  Throttle/Pedal Position Sensor/Switch "A" Circuit High Input
  • Throttle Position (TP) sensor (built into throttle body)
  • Open in VTA1 circuit
  • Open in E2 circuit
  • Short between VC and VTA1 circuits
  • ECM
 Comes on DTC stored Applies
P0125  Insufficient Coolant Temperature for Closed Loop Fuel Control
  • Engine Coolant Temperature (ECT) sensor
  • Cooling system
  • Thermostat
 Comes on DTC stored Applies
P0128  Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
  • Thermostat
  • Cooling system
  • Engine Coolant Temperature (ECT) sensor
  • ECM
 Comes on DTC stored Applies
P0136  Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
  • Heated Oxygen (HO2) sensor (sensor 2)
  • Air-fuel Ratio (A/F) sensor (sensor 1)
  • Gas leak from exhaust system
  • Fuel pressure
  • Fuel injector
  • PCV valve and hose
  • Air induction system
  • Integration relay (EFI relay)
 Comes on DTC stored -
P0137  Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2)
  • Open or short in Heated Oxygen (HO2) sensor (sensor 2) circuit
  • HO2 sensor (sensor 2)
  • HO2 sensor heater (sensor 2)
  • A/F sensor (sensor 1)
  • Integration relay (EFI relay)
  • Gas leak from exhaust system
 Comes on DTC stored Applies
P0138  Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)
  • Short in Heated Oxygen (HO2) sensor (sensor 2) circuit
  • HO2 sensor (sensor 2)
  • ECM internal circuit malfunction
  • A/F sensor (sensor 1)
 Comes on DTC stored -
P0139  Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)
  • Short in Heated Oxygen (HO2) sensor (sensor 2) circuit
  • HO2 sensor (sensor 2)
  • ECM internal circuit malfunction
  • A/F sensor (sensor 1)
 Comes on DTC stored -
P0141  Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
  • Open or short in Heated Oxygen (HO2) sensor heater circuit
  • HO2 sensor heater (sensor 2)
  • Integration relay (EFI relay)
  • ECM
 Comes on DTC stored -
P0171  System Too Lean (Bank 1)
  • Air induction system
  • Fuel injector blockage
  • Mass Air Flow (MAF) meter
  • Engine Coolant Temperature (ECT) sensor
  • Fuel pressure
  • Gas leak from exhaust system
  • Open or short in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor (sensor 1)
  • A/F sensor heater (sensor 1)
  • Integration relay (EFI relay)
  • A/F sensor heater and EFI relay circuits
  • PCV hose connections
  • PCV valve and hose
  • ECM
 Comes on DTC stored Applies
P0172  System Too Rich (Bank 1)
  • Fuel injector leak or blockage
  • Mass Air Flow (MAF) meter
  • Engine Coolant Temperature (ECT) sensor
  • Ignition system
  • Fuel pressure
  • Gas leak from exhaust system
  • Open or short in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor (sensor 1)
  • A/F sensor heater (sensor 1)
  • Integration relay (EFI relay)
  • A/F sensor heater and EFI relay circuits
  • ECM
 Comes on DTC stored Applies
P0220  Throttle/Pedal Position Sensor/Switch "B" Circuit
  • Throttle Position (TP) sensor (built into throttle body)
  • ECM
 Comes on DTC stored Applies
P0222  Throttle/Pedal Position Sensor/Switch "B" Circuit Low Input
  • Throttle Position (TP) sensor (built into throttle body)
  • Short in VTA2 circuit
  • Open in VC circuit
  • ECM
 Comes on DTC stored Applies
P0223  Throttle/Pedal Position Sensor/Switch "B" Circuit High Input
  • Throttle Position (TP) sensor (built into throttle body)
  • Open in VTA2 circuit
  • Open in E2 circuit
  • Short between VC and VTA2 circuits
  • ECM
 Comes on DTC stored Applies
P0300  Random/Multiple Cylinder Misfire Detected
  • Open or short in engine wire harness
  • Connector connection
  • Vacuum hose connection
  • Ignition system
  • Fuel Injector
  • Fuel pressure
  • Mass Air Flow (MAF) meter
  • Engine Coolant Temperature (ECT) sensor
  • Compression pressure
  • Valve clearance
  • Valve timing
  • PCV valve and hose
  • PCV hose connections
  • Air induction system
  • ECM
 Comes on/Blinks *1 DTC stored Applies
P0301  Cylinder 1 Misfire Detected
  • Same as DTC P0300
 Comes on/Blinks *1 DTC stored Applies
P0302  Cylinder 2 Misfire Detected
  • Same as DTC P0300
 Comes on/Blinks *1 DTC stored Applies
P0303  Cylinder 3 Misfire Detected
  • Same as DTC P0300
 Comes on/Blinks *1 DTC stored Applies
P0304  Cylinder 4 Misfire Detected
  • Same as DTC P0300
 Comes on/Blinks *1 DTC stored Applies
P0327  Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
  • Short in knock sensor circuit
  • Knock sensor
  • ECM
 Comes on DTC stored Applies
P0328  Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
  • Open in knock sensor circuit
  • Knock sensor
  • ECM
 Comes on DTC stored Applies
P0335  Crankshaft Position Sensor "A" Circuit
  • Open or short in Crankshaft Position (CKP) sensor circuit
  • CKP sensor
  • CKP sensor plate (Crankshaft)
  • ECM
 Comes on DTC stored Applies
P0339  Crankshaft Position Sensor "A" Circuit Intermittent
  • Same as DTC P0335
 - DTC stored Applies
P0340  Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)
  • Open or short in Camshaft Position (CMP) sensor circuit
  • CMP sensor
  • Camshaft
  • Jumped tooth of timing chain
  • ECM
 Comes on DTC stored Applies
P0351  Ignition Coil "A" Primary/Secondary Circuit
  • Ignition system
  • Open or short in IGF1 or IGT circuit (1 to 4) between ignition coil and ECM
  • No. 1 to No. 4 ignition coils
  • ECM
 Comes on DTC stored Applies
P0352  Ignition Coil "B" Primary/Secondary Circuit
  • Same as DTC P0351
 Comes on DTC stored Applies
P0353  Ignition Coil "C" Primary/Secondary Circuit
  • Same as DTC P0351
 Comes on DTC stored Applies
P0354  Ignition Coil "D" Primary/Secondary Circuit
  • Same as DTC P0351
 Comes on DTC stored Applies
P0420  Catalyst System Efficiency Below Threshold (Bank 1)
  • Front exhaust pipe (with Three-Way Catalytic Converter)
  • Gas leak from exhaust system
  • Air-Fuel Ratio (A/F) sensor (sensor 1)
  • Heated Oxygen (HO2) sensor (sensor 2)
 Comes on DTC stored Applies
P043E  Evaporative Emission System Reference Orifice Clog Up
  • Canister pump module (Reference orifice, leak detection pump, vent valve)
  • Connector/wire harness (Canister pump module - ECM)
  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
 Comes on DTC stored -
P043F  Evaporative Emission System Reference Orifice High Flow
  • Canister pump module (Reference orifice, leak detection pump, vent valve)
  • Connector/wire harness (Canister pump module - ECM)
  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
 Comes on DTC stored -
P0441  Evaporative Emission Control System Incorrect Purge Flow
  • Purge VSV
  • Connector/wire harness (Purge VSV - ECM)
  • Canister pump module
  • Leak from EVAP system
  • Leak from EVAP line (Purge VSV
  • Intake manifold)
  • ECM
 Comes on DTC stored -
P0443  Evaporative Emission Control System Purge Control Valve Circuit
  • Open or short in purge VSV circuit
  • Purge VSV
  • ECM
 Comes on DTC stored Applies
P0450  Evaporative Emission Control System Pressure Sensor/Switch
  • Canister pump module
  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
 Comes on DTC stored -
P0451  Evaporative Emission Control System Pressure Sensor Range/Performance
  • Canister pump module
  • Connector/wire harness (Canister pump module - ECM)
  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
 Comes on DTC stored -
P0452  Evaporative Emission Control System Pressure Sensor/Switch Low Input
  • Same as DTC P0451
 Comes on DTC stored -
P0453  Evaporative Emission Control System Pressure Sensor/Switch High Input
  • Same as DTC P0451
 Comes on DTC stored -
P0455  Evaporative Emission Control System Leak Detected (Gross Leak)
  • Fuel tank cap (loose)
  • Leak from EVAP line (Canister
  • Fuel tank)
  • Leak from EVAP line (Purge VSV - Canister)
  • Canister pump module
  • Leak from fuel tank
  • Leak from canister
 Comes on DTC stored -
P0456  Evaporative Emission Control System Leak Detected (Very Small Leak)
  • Fuel tank cap (loose)
  • Leak from EVAP line (Canister - Fuel tank)
  • Leak from EVAP line (Purge VSV - Canister)
  • Canister pump module
  • Leak from fuel tank
  • Leak from canister
 Comes on DTC stored -
P0500  Vehicle Speed Sensor "A"
  • Open or short in speed signal circuit
  • Vehicle speed sensor
  • Combination meter
  • ECM
  • Skid control ECU
 Comes on DTC stored Applies
P0504  Brake Switch "A"/"B" Correlation
  • Short in stop light switch signal circuit
  • STOP fuse
  • IGN fuse
  • Stop light switch
  • ECM
 - DTC stored Applies
P0505  Idle Control System Malfunction
  • ETCS (Electronic Throttle Control System)
  • Air induction system
  • PCV hose connections
  • ECM
 Comes on DTC stored Applies
P050A  Cold Start Idle Air Control System Performance
  • Throttle body
  • Mass air flow (MAF) meter
  • PCV system
  • Air cleaner filter element
  • Air induction system
  • VVT system
  • ECM
 Comes on DTC stored -
P0560  System Voltage
  • Open in back up power source circuit
  • Battery
  • Battery terminals
  • EFI fuse
  • ECM
 Comes on DTC stored Applies
P0604  Random Access Memory (RAM)
  • ECM
 Comes on DTC stored Applies
P0606  ECM/PCM Processor
  • Exhaust gas leak
  • Heated Oxygen (HO2) sensor (sensor 2)
  • ECM
 Comes on DTC stored Applies
P0607  Control Module Performance
  • ECM
 Comes on DTC stored Applies
P0617  Starter Relay Circuit High
  • Park/Neutral Position (PNP) switch (A/T *2)
  • Clutch start switch (M/T *2)
  • Starter relay circuit
  • Ignition switch
  • ECM
 Comes on DTC stored Applies
P0630  VIN not Programmed or Mismatch - ECM/PCM
  • ECM
 Comes on DTC stored -
P0657  Actuator Supply Voltage Circuit/Open
  • ECM
 Comes on DTC stored Applies
P0724  Brake Switch "B" Circuit High
  • Short in stop light switch signal circuit
  • Stop light switch
  • ECM
 Comes on DTC stored Applies
P2102  Throttle Actuator Control Motor Circuit Low
  • Open in throttle actuator circuit
  • Throttle actuator
  • ECM
 Comes on DTC stored Applies
P2103  Throttle Actuator Control Motor Circuit High
  • Short in throttle actuator circuit
  • Throttle actuator
  • Throttle valve
  • Throttle body
  • ECM
 Comes on DTC stored Applies
P2111  Throttle Actuator Control System - Stuck Open
  • Throttle actuator
  • Throttle body
  • Throttle valve
 Comes on DTC stored Applies
P2112  Throttle Actuator Control System - Stuck Closed
  • Same as DTC P2111
 Comes on DTC stored Applies
P2118  Throttle Actuator Control Motor Current Range/Performance
  • Open in ETCS (Electronic Throttle Control System) power source circuit
  • Battery
  • Battery terminals
  • ETCS fuse
  • ECM
 Comes on DTC stored Applies
P2119  Throttle Actuator Control Throttle Body Range/Performance
  • ETCS (Electronic Throttle Control System)
  • ECM
 Comes on DTC stored Applies
P2120  Throttle/Pedal Position Sensor/Switch "D" Circuit
  • Accelerator Pedal Position (APP) sensor
  • ECM
 Comes on DTC stored Applies
P2121  Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance
  • Accelerator Pedal Position (APP) sensor
  • ECM
 Comes on DTC stored Applies
P2122  Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input
  • Accelerator Pedal Position (APP) sensor
  • Open in VCP1 circuit
  • Open or ground short in VPA circuit
  • ECM
 Comes on DTC stored Applies
P2123  Throttle/Pedal Position Sensor/Switch "D" Circuit High Input
  • Accelerator Pedal Position (APP) sensor
  • Open in EPA circuit
  • ECM
 Comes on DTC stored Applies
P2125  Throttle/Pedal Position Sensor/Switch "E" Circuit
  • Accelerator Pedal Position (APP) sensor
  • ECM
 Comes on DTC stored Applies
P2127  Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input
  • Accelerator Pedal Position (APP) sensor
  • Open in VCP2 circuit
  • Open or ground short in VPA2 circuit
  • ECM
 Comes on DTC stored Applies
P2128  Throttle/Pedal Position Sensor/Switch "E" Circuit High Input
  • Accelerator Pedal Position (APP) sensor
  • Open in EPA2 circuit
  • ECM
 Comes on DTC stored Applies
P2135  Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation
  • Short between VTA1 and VTA2 circuits
  • Throttle Position (TP) sensor (built into throttle body)
  • ECM
 Comes on DTC stored Applies
P2138  Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation
  • Short between VPA and VPA2 circuits
  • Accelerator Pedal Position (APP) sensor
  • ECM
 Comes on DTC stored Applies
P2195  Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1)
  • Open or short in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor (sensor 1)
  • A/F sensor heater (sensor 1)
  • Integration relay (EFI relay)
  • A/F sensor heater and EFI relay circuits
  • ECM
 Comes on DTC stored -
P2196  Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1)
  • Same as DTC P2195
 Comes on DTC stored -
P2237  Oxygen (A/F) Sensor Pumping Current Circuit/Open (Bank 1 Sensor 1)
  • Open in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor (sensor 1)
  • ECM
 Comes on DTC stored Applies
P2238  Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
  • Open or short in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor (sensor 1)
  • ECM
 Comes on DTC stored Applies
P2239  Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
  • Open or short in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor (sensor 1)
  • ECM
 Comes on DTC stored Applies
P2252  Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1)
  • Open or short in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor (sensor 1)
  • ECM
 Comes on DTC stored Applies
P2253  Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1)
  • Open or short in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor (sensor 1)
  • ECM
 Comes on DTC stored Applies
P2401  Evaporative Emission Leak Detection Pump Stuck OFF
  • Canister pump module (Reference orifice, leak detection pump, vent valve)
  • Connector/wire harness (Canister pump module - ECM)
  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
 Comes on DTC stored -
P2402  Evaporative Emission Leak Detection Pump Stuck ON
  • Canister pump module (Reference orifice, leak detection pump, vent valve)
  • Connector/wire harness (Canister pump module - ECM)
  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
 Comes on DTC stored -
P2419  Evaporative Emission System Switching Valve Control Circuit Low
  • Canister pump module (Reference orifice, leak detection pump, vent valve)
  • Connector/wire harness (Canister pump module - ECM)
  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • ECM
 Comes on DTC stored -
P2420  Evaporative Emission System Switching Valve Control Circuit High
  • Canister pump module (Reference orifice, leak detection pump, vent valve)
  • Connector/wire harness (Canister pump module - ECM)
  • ECM
 Comes on DTC stored -
P2610  ECM/PCM Internal Engine Off Timer Performance
  • ECM
 Comes on DTC stored -
P2A00  A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)
  • Open or short in Air-Fuel Ratio (A/F) sensor (sensor 1) circuit
  • A/F sensor
  • ECM
 Comes on DTC stored -
HINT:
  • *1: MIL flashes when a catalyst damaging misfire is detected.
  • *2: A/T denotes Automatic Transaxle models and M/T denotes Manual Transaxle models.
  • *3: Only for Mexico models
RENDER: 1.0x

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
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