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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 04-15-2006, 03:52 PM   #1 (permalink)
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Question Fault Codes...

Yesterday I was telling my uncle how my car hasnt really had any problems beside routine mantainence, unfurtunatly i forgot to knock on wood.

My check engine light came on today and I went to Auto Zone to have them scan the car. I got 2 possible fault codes, but they are so dumb there that they were missing the correct book to look up the number. The stupid kid there told me to go to the dealer, and i said fuck that.

Do any of you know what P1421 or P1423 codes mean? Im going to assume that they are emissions. Hopefully just O2 sensors.

Let me know if there is a reference chart or something...
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Old 04-15-2006, 04:28 PM   #2 (permalink)
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It is the secondary air pump. It's a pump that comes on for a few seconds, or a couple of minutes, when you crank the car. Emissions related. There is also a valve involved, probably the p1423 code. I've never had a problem, but other people have, maybe they'll chime in.
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Old 04-15-2006, 04:42 PM   #3 (permalink)
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Ok, so online i found this...

P1421 Secondary Air System Bank 1 (BMW)
and
P1423 Intake Air High Pressure Switch Circuit High

I have a CAI... does that have something to do with it...?
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Old 04-15-2006, 07:03 PM   #4 (permalink)
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Quote:
Originally Posted by RexKing86
Ok, so online i found this...

P1421 Secondary Air System Bank 1 (BMW)
and
P1423 Intake Air High Pressure Switch Circuit High

I have a CAI... does that have something to do with it...?
ok for the p1421 u can replace ur secondary airbox,
DIY here: --> http://forums.bimmerforums.com/forum...threadid=92029

for the 1423, its actually this Secondary Air System (Bank 1)
here are the possible problems
1 - bad hose
2 - bad valve / diverter
3 - bad pump

here is a thread with the identical codes...http://tech.bentleypublishers.com/th...687&tstart=240
the second code doest look to good , i say take it to a mechanic or dealer asap...
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Old 04-15-2006, 07:22 PM   #5 (permalink)
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im checking 4 u...
Sweet man... let me know what you find
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Old 04-15-2006, 07:28 PM   #6 (permalink)
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Sweet man... let me know what you find
done..see above post
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Old 04-15-2006, 07:34 PM   #7 (permalink)
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I need to drive 200 miles to Boston tomorrow... will i make it?
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Old 04-15-2006, 07:36 PM   #8 (permalink)
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Quote:
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I need to drive 200 miles to Boston tomorrow... will i make it?
with a bad valve u risk ruining ur motor and costing u a crapload of $$$, i wouldnt drive it at all...
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Old 04-15-2006, 07:51 PM   #9 (permalink)
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Crap, Its because of my damn CAI. It rained yesterday and now i realized that water/moisture must have gotten in there and fucked it all up.
This was on another forum
"Re: OBD II Fault codes p1421, p1423
Posted: Aug 29, 2003 3:44 PM Reply


Ok took it to the dealer and here is the diagnosis for these codes.

Basically a valve stuck causing moisture to backup into the airpump which caused it to fail as well.

Solution is to replace valve, and air pump. Approx. $1,000 CDN to fix all this (yikes) luckily for me it was all covered under my extended warranty. This is apparently a fairly common problem with e36's."

would you all agree that this is why?! Im so mad at myself...
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Old 04-15-2006, 09:51 PM   #10 (permalink)
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Quote:
Originally Posted by RexKing86
Crap, Its because of my damn CAI. It rained yesterday and now i realized that water/moisture must have gotten in there and fucked it all up.
This was on another forum
"Re: OBD II Fault codes p1421, p1423
Posted: Aug 29, 2003 3:44 PM Reply


Ok took it to the dealer and here is the diagnosis for these codes.

Basically a valve stuck causing moisture to backup into the airpump which caused it to fail as well.

Solution is to replace valve, and air pump. Approx. $1,000 CDN to fix all this (yikes) luckily for me it was all covered under my extended warranty. This is apparently a fairly common problem with e36's."
thats the same thing i read, notice i listed 3 things that could cause that code....head to a mechanic boy, ur in trouble..
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Old 04-16-2006, 12:08 AM   #11 (permalink)
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The CAI doesn't have anything to do with the air pump. The air pump comes on when you first start the car to help with cold emissions. Only stays stays on a few seconds or about 2 minutes at most. Seems to be a common problem with later E36's.
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Old 04-20-2006, 11:25 AM   #12 (permalink)
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yeah, but what about the other code
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Old 04-20-2006, 02:52 PM   #13 (permalink)
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Both codes have to do with the air pump. Ones for the pump, ones for the valve.
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Old 04-20-2006, 04:37 PM   #14 (permalink)
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ooo, alright, i got very afraid when i heard "valve" i though it was internal. where is this thing?
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Old 04-20-2006, 06:45 PM   #15 (permalink)
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I don't have one of the later model cars, so I'm not sure. I believe it's on the passenger's side of the engine bay. It's purpose is to blow air into the exhaust port, or something like that, on cold start-ups. It's an emission thing. There is a valve, as I understand, that keep the exhaust from coming back into the pump. This is all speculation and I might be talking out my a**. There are people here that know more. AAtuning has a simulator you can put in place of the pump if it's bad. Quite a bit cheaper, I believe. Might try www.realoem.com and see if there is a picture of it somewhere.
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