2003 Chevrolet Impala Problems

RepairPal has identified the most common problems with the 2003 Chevrolet Impala as reported by actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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Known Problems

The spark plugs should be replaced every 100,000 miles. Our technicians recommend replacing the spark plug wires also at this time.

The intake manifold gasket can develop external engine oil or coolant leaks. In some cases the failed gasket will leak coolant internally. The manifold gasket will need to be replaced to correct this issue.

The crankshaft position sensor, ignition module, and/or powertrain control module (PCM) may fail resulting in illumination of the Check Engine Light with ignition system related fault codes stored in the PCM. Patience is necessary when dealing with this specific situation as normal diagnostic procedures are not effective. In many cases, the best option is to replace parts, one at a time until the fault is corrected.

Extended life coolant may become contaminated and require cooling system service before the recommended 100,000 miles.

Contaminated brake fluid can cause problems in the brake system and it should be flushed every 60,000 miles.