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1991 BMW M5 Check engine light at idle after long trips

Tiny
PIANCU
  • MEMBER
  • 1991 BMW M5
  • 6 CYL
  • 2WD
  • MANUAL
  • 181,000 MILES
Hello. After I drive my car for a long trip (80+ miles), the check engine light will come on with a code of 1221 (oxygen sensor) when the car is at idle, such as at a stop light. Once I start moving again, the check engine light goes away. I have a new water temp sensor, oxygen sensor, MAF and vacuum hoses. Why is this happening only at idle after long trips? Does not happen in city driving.
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Friday, May 14th, 2010 AT 11:53 AM

3 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Was the Oxygen sensor a Bosch direct replacement?
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Saturday, May 15th, 2010 AT 9:14 PM
Tiny
PIANCU
  • MEMBER
  • 2 POSTS
No, it was a Denso oxygen sensor. It has 10k miles on it.
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Monday, May 17th, 2010 AT 6:53 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
There might be an issue with the Denso part. The system was built for a Bosch sensor.
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Tuesday, May 18th, 2010 AT 9:37 AM

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