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.
1999 Isuzu OasisFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Identification
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC (MIL/"D4" Code) (1) | Description | ||||||
|---|---|---|---|---|---|---|---|
| P0107 (3) | MAP Sensor Circuit Low Voltage Input | ||||||
| P0108 (3) | MAP Sensor Circuit High Voltage Input | ||||||
| P0112 (10) | IAT Sensor Circuit Low Voltage Input | ||||||
| P0113 (10) | IAT Sensor Circuit High Voltage Input | ||||||
| P0116 (86) | ECT Sensor Circuit Range/Performance Problem | ||||||
| P0117 (6) | ECT Circuit Low Voltage Input | ||||||
| P0118 (6) | ECT Circuit High Voltage Input | ||||||
| P0122 (7) | Throttle Position Circuit Low Voltage Input | ||||||
| P0123 (7) | Throttle Position Circuit High Voltage Input | ||||||
| P0131 (1) | Primary HO2S-1 Low Voltage | ||||||
| P0132 (1) | Primary HO2S-1 High Voltage | ||||||
| P0133 (61) | Primary HO2S-1 Slow Response | ||||||
| P0135 (41) | Primary HO2S-1 Heater Circuit Malfunction | ||||||
| P0137 (63) | Secondary HO2S-2 Low Voltage | ||||||
| P0138 (63) | Secondary HO2S-2 High Voltage | ||||||
| P0139 (63) | Secondary HO2S-2 Slow Response | ||||||
| P0141 (65) | Secondary HO2S-2 Heater Circuit Malfunction | ||||||
| P0171 (45) | System Too Lean | ||||||
| P0172 (45) | System Too Rich | ||||||
| P0300 (71-74) (2) | 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 | ||||||
| P0325 (23) | Knock Sensor (KS) Circuit Malfunction | ||||||
| P0335 (4) | CKP Sensor No Signal Input | ||||||
| P0336 (4) | CKP Sensor Circuit Range/Performance Problem | ||||||
| P0401 (80) | EGR Insufficient Flow Detected | ||||||
| P0420 (67) | Catalyst System Efficiency Below Threshold | ||||||
| P0452 (91) | Fuel Tank Pressure Sensor Low Voltage | ||||||
| P0453 (91) | Fuel Tank Pressure Sensor High Voltage | ||||||
| P0505 (14) | Idle Control System Malfunction | ||||||
| P0700 (70/-) (1)(3) | Automatic Transmission | ||||||
| P0715 (70/15) (1)(3) | Automatic Transmission | ||||||
| P0720 (70/9) (1)(3) | Automatic Transmission | ||||||
| P0730 (70/41) (1)(3) | Automatic Transmission | ||||||
| P0740 (70/40) (1)(3) | Automatic Transmission | ||||||
| P0753 (70/7) (1)(3) | Automatic Transmission | ||||||
| P0758 (70/8) (1)(3) | Automatic Transmission | ||||||
| P0763 (70/22) (1)(3) | Automatic Transmission | ||||||
| P1106 (13) | BARO Sensor Circuit Range/Performance Problem | ||||||
| P1107 (13) | BARO Sensor Circuit Low Voltage Input | ||||||
| P1108 (13) | BARO Sensor Circuit High Voltage Input | ||||||
| P1121 (7) | Throttle Position Lower Than Expected | ||||||
| P1122 (7) | Throttle Position Higher Than Expected | ||||||
| P1128 (5) | Manifold Absolute Pressure Lower Than Expected | ||||||
| P1129 (5) | Manifold Absolute Pressure Higher Than Expected | ||||||
| P1259 (22) | VTEC System Malfunction | ||||||
| P1297 (20) | Electrical Load Detector Circuit Low Voltage Input | ||||||
| P1298 (20) | Electrical Load Detector Circuit High Voltage Input | ||||||
| P1359 (8) | CKP/TDC Sensor Connector Poor Connection | ||||||
| P1361 (8) | TDC Sensor Intermittent Interruption | ||||||
| P1362 (8) | TDC Sensor No Signal | ||||||
| P1381 (9) | CYP Sensor Intermittent Interruption | ||||||
| P1382 (9) | CYP Sensor No Signal | ||||||
| P1456 (90) | EVAP System Leak Detected (Fuel Tank Area) | ||||||
| P1457 (90) | EVAP System Leak Detected (Canister Area) | ||||||
| P1491 (12) | EGR Valve Insufficient Lift Detected | ||||||
| P1498 (12) | EGR Valve Lift Sensor High Voltage | ||||||
| P1519 (14) | Idle Air Control (IAC) Valve Circuit Failure | ||||||
| P1607 (-) | PCM Internal Failure "A" | ||||||
| P1705 (70/5) (1)(3) | Automatic Transmission | ||||||
| P1706 (70/6) (1)(3) | Automatic Transmission | ||||||
| P1738 (70/25) (1)(3) | Automatic Transmission | ||||||
| P1739 (70/26) (1)(3) | Automatic Transmission | ||||||
| P1753 (70/1) (1)(3) | Automatic Transmission | ||||||
| P1768 (70/16) (1)(3) | Automatic Transmission | ||||||
| P1773 (70/23) (1)(3) | Automatic Transmission | ||||||
| P1791 (70/4) (1)(3) | 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.