I have to say that the only engine management issues I've ever had with any car have been ones where the light has displayed and the car has continued to act normally.
On each occasion, whether I've used a paper clip to read out the code, or used my current £12 ebay special reader to acquire the fault code, the (single) error has pointed at the fault accurately, and when I've actually gone to the electrics guys they've just read the code and used their experience to diagnose (and come to the same conclusion as myself).
Exactly how often does a car go wrong in a complex way anyway? Seems to me that the only ones that tend to are those that are unnecessarily complex, particularly diesels and Renaults.
I guess this is what character must be.
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