check engine light
#1
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#5
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When you read a code from the ecu, it is typically due to some sensor reading being out of a normal or expected parameter range. Further, the manufacturer may offer a LIKELY cause for these faults, based on logical and statistical data, but that does not conclusively mean that is what is actually causing the fault; it's just a guide!! For the layperson, looking up these codes and following a repair/replacement based on the most likely culprit listed can sometimes be cost effective, but as you've now proven, sometimes this is why a skilled mechanic, one who understands the dymanics of the sytems and circuits involved, and can perform the appropriate diagnostics, can actually save you money in the long run by isolating the problem first, and then swapping just the right part.
Just out of curiosity, what code(s) did you read from your car?
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