Question about 1998 BMW 7 Series

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Engine code p1140 n p0505 not sure what they mean for 1998bmw 740il trying to pass emmission test.

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Generally when u can not pass the emission test your catalytic converter needs to be replaced. J.

Posted on Sep 27, 2010

  • BMWmech Jul 12, 2011

    Joe - you're incorrect! Wow if everytime a customer had failed an emission test due to ODBII codes I'd be a very rich man. But in reality if I replaced a catalytic per your reasoning, I'd either be sued to death or in jail for fraud!

    P0505 is Idle Control Valve malfunction and on a 98 7 series, if lucky it can be cleaned or will need to be replaced. P1140 is for the MAF and it too will either need to be cleaned with CRC MAF cleaner or replaced! Please don't claim GURU status if you don't really know! Be a true mechanic and help diagnose - not just an R&R parts monkey.

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