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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 12-03-2012, 02:05 PM
2ns2ls 2ns2ls is offline
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Location: Peoria, IL USA
Join Date: Nov 2007
Posts: 33
Mein Auto: 2001 530i 5spd
Check Engine Light Resolved with DISA Valve Replacement

Wanted to provide the group an update on my findings related to SES light. Off and on for the last 12 months, I've had issues with the light coming on and then clearing itself. For the last 3 months the light has been on consistently, never clearing itself.

The codes were: P313 - Misfire detected with low fuel, P171 - Bank 1 system too lean, and P174 - Bank 2 system too lean.

After reading up on the DISA valve issues, I inspected mine. However, the flap appeared to be working properly, and I was unable to detect an issue with it. I continued to look for possible leaks in other hoses, but never could find anything.

Last week I went ahead and ordered the replacement DISA valve, sure enough within a few days of running my SES light is cleared, and I can tell the engine runs slightly smoother at idle. The idle before wasn't too bad, but it would pulsate sometimes up and down around the idle RPM.
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Old 12-04-2012, 04:06 AM
uncmozo uncmozo is offline
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Location: upstate NY
Join Date: Apr 2010
Posts: 344
Mein Auto: 2002 530i 5 speed
Pesky little thing, that DISA valve. Glad you solved your problem.

1995 525i 5 speed - sold at 225,000 miles
2002 530i 5 speed - 187,000 miles
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