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.
1988 BMW 325is AutomaticFACTORY OEM SERVICE PROCEDURE
Trouble Code Identification
TROUBLE CODE IDENTIFICATION
| Codes | Affected Circuit | Probable Cause |
|---|---|---|
| 01 | Air Flow Sensor | Air Flow Sensor Flap Binding or Air Flow Sensor Potentiometer Faulty |
| 02 | O2 Sensor | Faulty O2 Sensor, Fuel Mixture Too Lean/Rich |
| 03 | Coolant Temp. Sensor | Coolant Temp. Sensor Faulty, Engine Runs Too Hot/Cold |
| 04 | Throttle Switch | Faulty Throttle Switch, Adjusted Incorrectly |
Factory Service Tools
Use the Manual With the Right Hardware
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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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