Oh No! Help! 1/4 CEL and smog test!

mj_duell · Apr 7, 2009

f355spider said: ↑

I had a similar experience with Bosch O2 pre cat O2 sensors on my BMW 540. I got a "check engine" light (actually BMW has a "service engine soon" light) that I scanned and the code is for a bad left side pre-cat O2 sensor. I decided to replace them both and a few days later I get a another light for the right side! Yup, bad sensor. So I replace the right side again, and now all is well. Fortunately the online parts source I use, happily credited my account. (www.autohausaz.com)

Good you have pre OBDII. If you have OBDII, and clear the codes after the repair, you still have to drive several cycles and rack up a bunch of miles to set all the "ready" parameters. If two or more parameters are showing "not ready", you will not pass the emission test, and they require you to come back after you have driven the car more. This is becoming standard in more states, the reason it to prevent people from simply clearing codes before taking the test. Basically you have to drive suffiently that if you had a fault, it would trip the "check engine" light.
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I was suprised to see a Bosch O2 go bad. All is well now and the car runs just beautiful. I also purchased my O2's online for what I think is probably the best price possible, $111.64 shipped for both. Got them from http://www.nextdayautoparts.com/ShowParts.aspx?Pno=15727, they are crediting me for the replacement. I love just disconnecting the battery and wiping the codes! I did a full reinitialization before I took it for the smog test.

--Mike

3forty8 · Apr 7, 2009

mj_duell said: ↑

Well I changed out the 1/4 O2 and drove it around this morning. I had my test at 2:30 this afternoon and she passed! I haven't seen the CEL since changing the O2 so mabye I got a bad one the first time around....we'll see. Either way I'm cleared to register the car in Connecticut!
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Way to go Mike!

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Oh No! Help! 1/4 CEL and smog test!

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