1991 Volkswagen Jetta Problem Reports

Most Reported 1991 Volkswagen Jetta Problem Reports

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Shifting issues due to internal problems in high mileage automatic transmissions can be difficult to resolve without transmission replacement.

Reverse gear failures and noise in the manual transmission models are common.

Electrical issues that are difficult to diagnose—and sometimes intermittent—are typically due to ground wiring issues. The most troublesome ground locations are under the battery or at the engine.

The water pump and/or other cooling system may develop a coolant leak. Oil leaking from the  valve cover gasket is also common.

Heater core leaks are common in this model, more so if the wrong anti-freeze/coolant is used in the cooling system.

Ignition wire breakdown is common, resulting in misfires.

Poor drivability symptoms—including hard starting—can be caused by coolant temperature sensor and oxygen sensor faults.

Extensive transmission damage can occur in some of the automatic transmission models when the transmission oil cooler fails and allows coolant to mix with the automatic transmission fluid.