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Hi all so i recently bought a 08 Mazda 3 with the 2.3. For the record the guy told me one of the cats have been removed and one of the big coffee can exhaust tips put on. So the cel came on and checked out as p2177 (system too lean off idle bank 1) and it we recommended I change the maf sensor. Instead I cleaned it. Light is still on. Car is running and driving smooth aside from a pinging under decent acceleration which I've convinced myself is a loose heat shield. Any suggestions?
 
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