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.
1998 Acura 2.5TLFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code (DTC) Identification
DIAGNOSTIC TROUBLE CODE (DTC) TEST DIRECTORY
| DTC (MIL Code) (1) | Description | ||||
|---|---|---|---|---|---|
| P0102 (50) | MAF Sensor Circuit Low Voltage Input | ||||
| P0103 (50) | MAF Sensor Circuit High Voltage Input | ||||
| P0111 (10) | IAT Sensor Range/Performance Problem | ||||
| P0112 (10) | IAT Circuit Low Voltage Input | ||||
| P0113 (10) | IAT Circuit High Voltage Input | ||||
| P0116 (86) | ECT Sensor Range/Performance Problem | ||||
| P0117 (6) | ECT Circuit Low Voltage Input | ||||
| P0118 (6) | ECT Circuit High Voltage Input | ||||
| P0122 (7) | TP Sensor Circuit Low Voltage Input | ||||
| P0123 (7) | TP Circuit High Voltage Input | ||||
| P0130 (1) | HO2S-1 Circuit Malfunction | ||||
| P0133 (61) | HO2S-1 Slow Response | ||||
| P0135 (41) | HO2S-1 Heater Circuit Malfunction | ||||
| P0139 (63) | HO2S-2 Slow Response | ||||
| P0141 (65) | HO2S-2 Heater Circuit Malfunction | ||||
| P0171 (45) | Fuel System Too Lean | ||||
| P0172 (45) | Fuel System Too Rich | ||||
| P0300 (76) | Random Misfire Detected | ||||
| P0301 (71) | Cylinder No. 1 Misfire Detected | ||||
| P0302 (72) | Cylinder No. 2 Misfire Detected | ||||
| P0303 (73) | Cylinder No. 3 Misfire Detected | ||||
| P0304 (74) | Cylinder No. 4 Misfire Detected | ||||
| P0305 (75) | Cylinder No. 5 Misfire Detected | ||||
| P0327 (23) | Front KS Circuit Input Voltage Low | ||||
| P0328 (23) | Front KS Circuit Input Voltage High | ||||
| P0332 (53) | Rear KS Circuit Input Voltage Low | ||||
| P0333 (53) | Rear KS Circuit Input Voltage High | ||||
| P0335 (4) | CKP Sensor No Signal Input | ||||
| P0336 (4) | CKP Sensor Range/Performance | ||||
| P0401 (80) | EGR Insufficient Flow Detected | ||||
| P0420 (67) | Catalyst System Efficiency Below Threshold | ||||
| P0440 (90) | EVAP Control System Leak Detected | ||||
| P0452 (91) | Fuel Tank Pressure Sensor (FTPS) Low Voltage | ||||
| P0453 (91) | Fuel Tank Pressure Sensor (FTPS) High Voltage | ||||
| P0500 (17) | VSS Circuit Low Input | ||||
| P0505 (14) | Idle Control System | ||||
| P0700 (70) | (2) Automatic Transmission | ||||
| P0715 (70) | (2) Automatic Transmission | ||||
| P0720 (70) | (2) Automatic Transmission | ||||
| P0725 (70) | (2) Automatic Transmission | ||||
| P0730 (70) | (2) Automatic Transmission | ||||
| P0740 (70) | (2) Automatic Transmission | ||||
| P0753 (70) | (2) Automatic Transmission | ||||
| P0758 (70) | (2) Automatic Transmission | ||||
| P1102 (50) | Mass Airflow Lower Than Expected | ||||
| P1103 (50) | Mass Airflow Higher Than Expected | ||||
| P1106 (13) | BARO Pressure Sensor Range/Performance Problem | ||||
| P1107 (13) | BARO Pressure Sensor Circuit Low Voltage Problem | ||||
| P1108 (13) | BARO Pressure Sensor Circuit High Voltage Problem | ||||
| P1121 (7) | Throttle Position Lower Than Expected | ||||
| P1122 (7) | Throttle Position Higher Than Expected | ||||
| P1297 (20) | ELD Circuit Low Voltage Input | ||||
| P1298 (20) | ELD Circuit High Voltage Input | ||||
| P1336 (54) | CKF Sensor Intermittent Interruption | ||||
| P1337 (54) | CKF Sensor No Signal | ||||
| P1359 (8) | CKP/TDC/CYP Sensor Disconnected | ||||
| P1361 (8) | TDC Sensor Intermittent Interruption | ||||
| P1362 (8) | TDC Sensor No Signal | ||||
| P1381 (9) | CYP Sensor Intermittent Interruption | ||||
| P1382 (9) | CYP Sensor No Signal | ||||
| P1491 (12) | EGR Valve Insufficient Lift Detected | ||||
| P1498 (12) | High Voltage In EGR Valve Lift Sensor Detected | ||||
| P1508 (14) | IAC Valve Circuit Failure | ||||
| P1660 (70) | A/T FI Data Line Failure | ||||
| P1681 (30) | Low Voltage In A/T FI Signal "A" | ||||
| P1682 (30) | High Voltage In A/T FI Signal "A" | ||||
| P1686 (31) | Low Voltage In A/T FI Signal "B" | ||||
| P1687 (31) | High Voltage In A/T FI Signal "B" | ||||
| P1705 (70) | (2) Automatic Transmission | ||||
| P1706 (70) | (2) Automatic Transmission | ||||
| P1753 (70) | (2) Automatic Transmission | ||||
| P1758 (70) | (2) Automatic Transmission | ||||
| P1768 (70) | (2) Automatic Transmission | ||||
| P1786 (70) | (2) Automatic Transmission | ||||
| P1787 (70) | (2) Automatic Transmission | ||||
| P1790 (70) | (2) Automatic Transmission | ||||
| P1791 (70) | (2) Automatic Transmission | ||||
| P1792 (70) | (2) Automatic Transmission | ||||
| P1794 (70) | (2) Automatic Transmission | ||||
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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.