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.
Problems for specific Chevrolet Impala years:
Car problem reports
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Most reported 2003 Chevrolet Impala problems
DexCool antifreeze formed brown gel-like sludge, first observed at radiator cap. Supposed to last 100,000 miles. Lawsuit settled for cases where engine failed. Flushed system and replaced coolant. Keep air out of system by ensuring coolant reservoir always at proper level and check radiator periodically by removing cap.
Wiper arm came loose and would not turn during heavy snow storm. Fixed by pulling cap off nut holding arm down. Ensure arm in correct place and tighten down nut, then replace cap.