Originally Posted by Merlin8r OK, so had a full weekend and a bit to road test the machine. She's fixed! Runs clean, more power, double the fuel economy, no bad smells. NOW I'm getting what I expected from VW ownership. The morale of this story is, don't rely on the computers to tell you what's wrong with your car! So what was the final diagnoses and fix?
Bad O2 sensor. Was still functional, but so full of carbon it was giving dud instructions to the ECM. The MAF sensor and coolant sender had been replaced 2 years ago. Good bet that the O2 should have been replaced too.
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