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      01-15-2013, 01:10 PM   #20
Mike Benvo
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Drives: 08 E90 M3 / 400whp Turbo 7
Join Date: Apr 2008
Location: SoCal

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1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
2008 BMW M3  [5.00]
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Quote:
Originally Posted by 96LTWM3 View Post
P2629
o2 sensor pumping current trim circuit/open.

P0491
Secondary air injection system insufficient.
I cleared them twice and the same ones came back.
Like Mike said, its probably a bad o2, but how can I tell which one based on these codes? Does "Secondary" refer to post cat? Is there a different part number for post and pre o2? Im going to call my SA tomorrow to order the part, he can get it to me at his cost. Im assuming changing an o2 should be pretty simple.
274B - P2629:
Oxygen sensor pump current calibration fault before cat. converter, bank 2
O2 Sensor Pumping Current Trim Circuit/Open (Bank 2 Sensor 1)

Oxygen sensor is available, oxygen sensor voltage > 4951
mV (K_LAVK_OBD_SA_DIAG_OL)

Looks like that sensor is damaged. Replace it and you should be fine. This is a pre cat sensor so it's much more important than a post cat sensor.


As far as the secondary air system, this is for emissions only. Doesn't have to do with post cat o2 sensor. Secondary air system pumps fresh air into the heads to warm up the cats faster on cold start. Replace the faulting o2 sensor first and let me know if this one comes back.
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