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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, Jun-27-2010, 04:47:37 AM   #11
notopM3
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Originally Posted by alanil View Post
If you want to save some $$ just do the pre-cat ones. Those are the only ones used by the engine for air fuel mixture. They should be replaced at about 100k miles to keep the car running most efficiently and with the lowest emissions.

The post cat O2s are for the car to sense that the cats are working. The computer is just checking the voltage of those O2s for a "pass" or "fail".
I doubt my sensors have been changed in a long time. An easy DIY.

Just checked O2 prices some-***** those things are expensive!
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Old Sun, Jun-27-2010, 10:17:33 AM   #12
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I replaced my O2 sensors, new plugs, fresh oil etc, etc.....
Then went to get tested. The HC was over at 56ppm.

I then drove it around hard on a warm day and tested again. 53ppm.
I think the cats won't pass in 2011.
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Old Sun, Jun-27-2010, 06:51:13 PM   #13
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could be a bunch of things.......from a simple oil change to inefficient cats
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Old Sun, Jun-27-2010, 07:04:21 PM   #14
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could be a bunch of things.......from a simple oil change to inefficient cats
Well, it has new oil and new plugs. Trying to narrow it down before going to the cats. The car runs great otherwise.
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Old Sun, Jun-27-2010, 07:10:56 PM   #15
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Well, it has new oil and new plugs. Trying to narrow it down before going to the cats. The car runs great otherwise.
you passed....thats all that matters. i'd worry again 2 years from now
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Old Sun, Jun-27-2010, 08:22:14 PM   #16
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you passed....thats all that matters. i'd worry again 2 years from now
Very good point. But I was thinking that there is all this unburnt gas leaking out...if I fixed that problem it would help with the MPGs. Plus it would give me an excuse to noodle around on the car.

Off topic, but I see your England avatar. I lived in North London back in the 80's. Just wondering why the old school flag. Has the Union Jack been replaced? Even in the World Cup they are using the red cross. Just curious.
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Old Sun, Jun-27-2010, 08:36:20 PM   #17
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Very good point. But I was thinking that there is all this unburnt gas leaking out...if I fixed that problem it would help with the MPGs. Plus it would give me an excuse to noodle around on the car.

Off topic, but I see your England avatar. I lived in North London back in the 80's. Just wondering why the old school flag. Has the Union Jack been replaced? Even in the World Cup they are using the red cross. Just curious.
1 ppm just under isn't gonna kill ya pocket or hurt the enviroment.

as for the flag.....the flag i have is the official flag of england which is the st george's cross. the union jack is the UK flag which is a combination of both the english and scottish flags. so england, scotland, northern ireland and wales is also known at great britain or the united kingdom.

i chose the st georges flag to be more politically correct
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Discussing California smog check in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)