Quote:
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Originally Posted by Bismark
IT IS VERY UNLIKELY THAT ALL 4 O2 SENSORS ARE BAD AT THE SAME TIME. IT IS UNLIKELY THAT 2 SENSORS GO OUT AT THE SAME INSTANT. I THINK YOU HAVE AN AIR LEAK PAST THE MAF. CHECK THE AIR HOSES AFTER THE AIR FILTER ALL THE WAY TO THE INTAKE MANIFOLD. LOOK CAREFULLY AT THE ROUND FAT BELLOWED AIR DUCT ( PART # 13-54-1-440-102 ). GOOD LUCK.
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OK, this was actually some good advice. I recently had my tranny rebuilt a second time due to a faulty TC (no expense to me). Soon afterwards I had an SES light and it was diagnosed as 2 faulty O2 sensors which had been replaced a little over 30K miles ago. Dorve it home after the repair and next morning light was back on. Took it back and they said one of the new O2 sensors was faulty, so replaced. One week later, SES light is back, plus a high-pitched chirping noise upon acceleration. Got call this morning saying it is fixed - ended up an exhaust flange had been knocked loose apparently when they were reinstalling the tranny, so I did have an air leak as mentioned by Bismark, but way after the MAF.
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2001 X5 3.0i (PP/WP/AP) Traded at
213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!
