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Old 11-23-2006, 03:52 PM
stopplyrh8n stopplyrh8n is offline
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Location: maryland
Join Date: Nov 2006
Posts: 3
Mein Auto: X5
check engine light 1421/1423 error code

My check engine light just came on and i ran the codes and it gave me a 1421 and 1423. does anyone know what the issue can be. i took it to a shop and they said it could be the Air mass Meter, or Air Pump. is this true or if anyone has had this issue how did they fix it.
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Old 01-29-2007, 04:59 PM
viejopatron viejopatron is offline
Location: Newport Beach, CA
Join Date: Jul 2005
Posts: 3
Mein Auto: 1997 528i
Well this is what my OBD II said. What did you find out?

View / Vehicle Trouble Log / Record Problem 12
Time : 1/29/2007 4:38 PM
Vehicle : 1997 E39
CarChip : K-2670-B
Trouble Code : P1421
Description : Unknown Powertrain DTC (Manufacturer Controlled; Auxiliary Emission Controls)
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Old 02-25-2007, 11:10 AM
wolfemc wolfemc is offline
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Location: Cartersville, GA
Join Date: Feb 2007
Posts: 1
Mein Auto: 1997 328i
I'm going through the same thing (P1421 / P1423) with a '97 328i that I bought this week. From researching the forums, you can pretty well bet it's either the non-return valve mounted to your exhaust manifold or the air pump or both. Check ebay for BMW OBDII air pump if you want a picture of what to look for. With the engine cold, disconnect the hose from the outlet of the pump and turn the engine on. The air pump should sound like a turbo fan and should be blowing out of the discharge. If it's not bad, don't hook the hose back up until you check the valve. I'm going out to check the valve this afternoon, so if I figure out anything, I'll update.
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