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If you have a laptop that you can carry to the car once in a while, get PC based scanner software with OBD cable. That will get you the most for the cheapest.
Handheld scanners are nice, but you still get what you pay for. Avoid the cheaper models that only say pass/fail/erase. You want one that will do some diagnostics and not just read a code and leave you guessing.
My wife's Audi had a P1176 - rear O2 sensor at upper limit. Dealer's solution was to replace the sensor, mine was to replace the leaking flex pipe. Nothing wrong with the O2 sensor, it was just doing its job.
Klaus
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There is no present time, just the past and future
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