Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Honda Prelude Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics
- Introduction
- Self-Diagnostic System
- Summary
- Diagnostic Trouble Code Identification
- Connector Identification
- Diagnostic Tests
- Notes
- DTC P0107: Map Sensor Circuit Low Voltage
- DTC P0108: Map Sensor Circuit High Voltage
- DTC P0112: Intake Air Temperature (IAT) Sensor Circuit Low Voltage
- DTC P0113: Intake Air Temperature (IAT) Sensor Circuit High Voltage
- DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Problem
- DTC P0117: Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
- DTC P0118: Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
- DTC P0122: Throttle Position (TP) Sensor Circuit Low Voltage
- DTC P0123: Throttle Position (TP) Sensor Circuit High Voltage
- DTC P0131: Primary Ho2S-1 Low Voltage
- DTC P0132: Primary Ho2S-1 High Voltage
- DTC P0133: Primary Ho2S-1 Slow Response
- DTC P0135: Primary Ho2S-1 Heater Circuit Malfunction, Or DTC P0141: Secondary Ho2S-2 Heater Circuit Malfunction
- DTC P0137: Secondary Ho2S-2 Low Voltage
- DTC P0138: Secondary Ho2S-2 High Voltage
- DTC P0139: Secondary Ho2S-2 Slow Response
- DTC P0171: Fuel System Too Lean, Or DTC P0172: Fuel System Too Rich
- DTC P0300: Random Misfire Detected
- DTC P0301-P0304: Cylinder No. 1-No. 4 Misfire Detected
- DTC P0325: Knock Sensor (KS) Circuit Malfunction
- DTC P0335: Crankshaft Position Sensor Malfunction, DTC P0336: Crankshaft Position Sensor Circuit Range/Performance Problem, DTC P1361: TDC Sensor Circuit - Intermittent Interruption &/Or DTC P1362: TDC Sensor Circuit - No Signal
- DTC P0401: EGR - Insufficient Flow Detected
- DTC P0420: Catalytic System Efficiency Below Threshold
- DTC P0451: Fuel Tank Pressure (Ftp) Sensor Range/Performance Problem
- DTC P0452: Fuel Tank Pressure (Ftp) Sensor Circuit Low Voltage
- DTC P0453: Fuel Tank Pressure (Ftp) Sensor Circuit High Voltage
- DTC P0500: Vehicle Speed Sensor (VSS) Circuit Malfunction
- DTC P0505: Idle Control System Malfunction
- DTC P1106: BARO Sensor Circuit Range/Performance Problem
- DTC P1107: BARO Sensor Circuit Low Voltage, Or DTC P1108: BARO Sensor Circuit High Voltage
- DTC P1121: Throttle Position Lower Than Expected, Or DTC P1122: Throttle Position Higher Than Expected
- DTC P1128: Manifold Absolute Pressure (Map) Lower Than Expected
- DTC P1129: Manifold Absolute Pressure (Map) Higher Than Expected
- DTC P1259: VTEC System Malfunction
- DTC P1297: Electrical Load Detector Circuit Low Voltage
- DTC P1298: Electrical Load Detector Circuit High Voltage
- DTC P1359: CKP/TDC Sensor Connector Disconnection
- DTC P1381: Cylinder Position Sensor - Intermittent Interruption, Or DTC P1382: Cylinder Position Sensor - No Signal
- DTC P1456: EVAP System Leak Detected (Fuel Tank System)
- DTC P1457: EVAP System Leak Detected (EVAP Canister System)
- DTC P1491: EGR Valve - Insufficient Lift Detected
- DTC P1498: EGR Valve Position Sensor Circuit High Voltage
- DTC P1508: Idle Air Control (IAC) Valve Circuit Malfunction
- DTC P1607: Pcm Internal Circuit Failure
- DTC P1655: SEAF/SEFA Signal Line Failure (A/T)
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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