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.

1989 Volkswagen Fox BaseFACTORY OEM SERVICE PROCEDURE

Trouble Code Identification

TROUBLE CODE IDENTIFICATION (FOX) ⁽¹⁾

DTC ⁽²⁾ (Blink) Code

System/ Affected Circuit

Possible Cause/Repair

00000 (4444)

No Fault

System Okay

00518 (2212)

TV Potentiometer

Open Ckt (No Signal To ECM)

00522 (2312)

Coolant Temp. Sensor

Open/Short To B+

00523 (2322)

Intake Air Temp.

Open/Short (No Signal To ECM)

00525 (2342)

O2 Sensor

Open Ckt (No Signal To ECM)

00537 (2341)

O2 Sensor Control

⁽³⁾ Control Limit Exceeded Or

Not Reached

00552 (2323)

Airflow Sensor Potentiometer

Open Ckt (No

Signal To ECM)

01249 (4411)

Injector Drive Ckt

Open Ckt/Defective Injectors

65535 (1111)

ECM

Replace Faulty ECM

⁽¹⁾	For testing information, see appropriate PIN VOLTAGE CHART S article in this section.

⁽²⁾	Blink code is 4-digit malfunction indicator CHECK ENGINE light code.

⁽³⁾	Check for near empty fuel tank. Check for CO level (fuel mixture) not within specified range (too high or too low). Check oxygen sensor circuit for a short circuit to ground.

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.

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