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      10-03-2011, 12:59 AM   #1
debdoub
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M5 E39

Hi,
I have 2000 M5 w/ engine light on, mechanic said cats are fine MAF\'s vanos all fine but I can\'t figure out why the ESL coming intermittently, any help please, car has only 79k miles, it had Bola exhaust, a Porsche mechanic suspecting this might be the culprit for engine light on, I\'m not convinced though.
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      10-03-2011, 07:02 PM   #2
debdoub
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M5 engine light on

Hi,
I have 2000 M5 w/ engine light on, mechanic said cats are fine MAF's vanos all fine but I can't figure out why the ESL coming intermittently, any help please, car has only 79k miles, it has Borla exhaust, a friend of mine a Porsche mechanic suspecting the Borla exhaust is the reason
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      10-03-2011, 11:58 PM   #3
cdmulders
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I have a 2000 E39 528i. I had a check engine light on for nearly three years - the diagnostics from two sources couldn't find a problem, just like yours. MAF sensors were OK, VANOS was OK, sensors after the catalytic converters were OK. Fuel was OK. The engine ran fine, but would occasionally smell lean. Finally, on a very cold winter day, the problem became such that the car would barely run. The techs found a crack in a plastic intake chamber/manifold, after the MAF sensor. They replaced it (for approx $100) and after that, I haven't had a check-engine light at all, and it continues to run very well. Magic! The crack must not have been visible before, nor was it showing anything with smoke tests and all of the other things the techs had done to find a vacuum leak previously, but it must have been enough to convince the electronics that something was out of whack, thereby generating the check-engine light. Maybe yours has this problem?

Good luck.
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      10-06-2011, 01:37 AM   #4
debdoub
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M5 2000

Thanks for your response, it turned out it is a crack very tiny close to one of the O2 sensor, he sealed it
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      11-08-2011, 12:16 PM   #5
prostock3
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i miss my m5
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