E46Fanatics - View Single Post - Secondary Air Pump & Valve
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Old 03-14-2010, 09:00 PM   #9
Registered User
Join Date: Apr 2005
Location: northern il
Posts: 48
My Ride: 2000 323i
I am getting the same error code with our 2000 323I. P1423 and P1421. I cleared the codes off the car Thursday night and they did not come back till Saturday night. About 2-3min after the car started. The car is getting worse gas millage after the codes go on.

The car has 150K on it. Sould I try the Seafoam first?
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