540i Calif. Smog / Cats / Oxygen Sensors - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 07-15-2011, 08:37 PM
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540i Calif. Smog / Cats / Oxygen Sensors

Hey ...

1995 540i. Original California car.

The car failed the HC part of smog test - not by much. Max = 57, Measured = 64

So it's running a bit rich then?

I have not yet looked under this car, I have had it about 1 week now.

The guy doing the smog said the cats looked very old.

The muffler shop says they have a Magnaflow Cat - installed price $340.

* Anyone else have a Magnaflow Cat???

* Should I replace the O2 sensors at the same time?

Any input on the HC is appreciated.

Thx.
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#2 (permalink) Old 07-18-2011, 07:07 PM
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Update: The car has two cats and two oxygen sensors, one for each bank. They feed into one collector.

The Magnaflow book is wrong (at least for California cars).

Also, some books will tell you the car has 4 oxygen sensors (California). It doesn't, it has two.

The CarFax shows the first sale( lease ) so I know the car was not imported to California from another state.

developing...
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#3 (permalink) Old 07-19-2011, 03:21 PM
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I think Hydrocarbon is formed by slight water-ingress OR a leaner running engine...
BUT... These hydrocarbons may be already present in the mufflers/exhaust system and are being passed by pressure, in this case - a new exhaust wight fix it...
Good luck mate...


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#4 (permalink) Old 07-20-2011, 05:28 PM
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Final Update: Passed Smog. California car.

The car has two cats. Each cat is bolted straight to the header.

Just before each cat is an oxygen sensor. There are no oxygen sensors behind the cats.

The two cats then feed into a collector where it goes single exhaust from that point on.

If you have a California car, it will not look like the diagrams you see online.

Anyway, one of the cats was disintegrated inside. The other cat was okay.

Yes, Magnaflow makes the high-flow cats for California cars. Ran me $380 installed with tax - out the door.

In any event, the smog now is WELL within limits and the car seems mildly smoother.


Next up. Struts and suspension.
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#5 (permalink) Old 07-21-2011, 04:20 PM
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Hey-Ho ... Glad to here it passed matey ;-)


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