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.
A/T Models Except ULEV
- CHECK EXHAUST AIR LEAK
- Start engine and run it at idle.
- Listen for an exhaust air leak before three way catalyst (manifold).
OK or NG
- OK: GO TO 2.
- NG: Repair or replace.
- CHECK FOR INTAKE AIR LEAK AND PCV HOSE
- Listen for an intake air leak after the mass air flow sensor.
- Check PCV hose connection.
OK or NG
- OK: GO TO 3.
- NG: Repair or replace.
- CHECK AIR FUEL RATIO (A/F) SENSOR 1 CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect A/F sensor 1 harness connector and ECM harness connector.
- Check harness continuity between ECM terminals and A/F sensor 1 terminals as follows.
Refer to WIRING DIAGRAM .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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