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.
1996 Geo Prizm Base, AutomaticFACTORY OEM SERVICE PROCEDURE
DTC Definitions
DTC IDENTIFICATION
| DTC | Description | Type | ||
|---|---|---|---|---|
| P0105 | Manifold Absolute Pressure Sensor Circuit | A | ||
| P0106 | MAP Sensor System Performance | A | ||
| P0110 | Intake Air Temperature Sensor Circuit | A | ||
| P0115 | Engine Coolant Temperature Sensor Circuit | A | ||
| P0116 | ECT Sensor Circuit Performance | A | ||
| P0120 | Throttle Position (TP) Sensor Circuit | A | ||
| P0121 | Throttle Position (TP) Sensor Circuit Performance | A | ||
| P0125 | Excessive Time To Enter Closed Loop | A | ||
| P0130 | Oxygen Sensor 1 (O2S1) Circuit | B | ||
| P0133 | Oxygen Sensor 1 (O2S1) Slow Response | B | ||
| P0136 | Heated Oxygen Sensor 2 (HO2S2) Circuit | B | ||
| P0141 | Heated Oxygen Sensor 2 (HO2S2) Heater Circuit | B | ||
| P0171 | Fuel Trim System Lean | B | ||
| P0172 | Fuel Trim System Rich | B | ||
| P0300 | Engine Misfire Detected | B | ||
| P0301 | Cylinder No. 1 Misfire Detected | B | ||
| P0302 | Cylinder No. 2 Misfire Detected | B | ||
| P0303 | Cylinder No. 3 Misfire Detected | B | ||
| P0304 | Cylinder No. 4 Misfire Detected | B | ||
| P0325 (1) | Knock Sensor (KS) Circuit | B | ||
| P0335 | Crankshaft Position (CKP) Sensor Circuit | B | ||
| P0340 | Camshaft Position (CMP) Sensor Circuit | B | ||
| P0401 | EGR Flow Insufficient | B | ||
| P0402 | Exhaust Gas Recirculation (EGR) Flow Excessive | B | ||
| P0420 | Three-Way Catalyst (TWC) System Efficiency Low | B | ||
| P0500 | Vehicle Speed Sensor (VSS) Circuit | A | ||
| P0505 | Idle Control System | B | ||
| P1300 | Ignition Control Module (Ignitor) Circuit | A | ||
| P1335 | Crankshaft Position (CKP) Sensor Circuit | A | ||
| P1500 | Starter Signal Circuit | A | ||
| P1600 | PCM Battery | A | ||
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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.