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What is your question?
Service engine light on, sent car to 2 places that couldn't find the issue for a 304 code.3rd person/mechanic scanned the car and came up with 304 code and the words crankshaft sensor, The car runs good, no misfiring, everything is as it should be and is smooth. So we got a gm sensor and put it on , erased the codes and 14 miles later light back on in the car, re-scan and same error code and msg. I a sticker cannot be gotten because of the car light being on.
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Are you sure about code 304? 304 indicates a misfire on cylinder 4. The crank sensor is code 335 or 336. If it is 304, check the usual culprits. Distributor cap, wires, spark plug. If these are OK, it might be the fuel injector or wiring to it.