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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 09-22-2012, 04:54 PM
ckeith ckeith is offline
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P1429 - Clarification?

Can someone clarify something for me? I get p1429 dtc and i can't figure it out for the life of me. BMW dealer wouldn't say **** and kept their mouth shut. Is this primary air pump (i am 99.9999% positive it's not), is it the secondary air pump (mine is working fine) or is this pointing towards the damn leak diagnostic pump for the fuel tank? I am going crazy
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  #2  
Old 09-22-2012, 06:34 PM
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Fast Bob Fast Bob is offline
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I saw one other person with this problem. IIRC, the Leak Diagnosis Pump was frozen in the open position, causing the code to be generated.

See part #03 in this diagram:

http://realoem.com/bmw/showparts.do?...39&hg=16&fg=10
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  #3  
Old 09-22-2012, 07:04 PM
ckeith ckeith is offline
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Quote:
Originally Posted by Fast Bob View Post
I saw one other person with this problem. IIRC, the Leak Diagnosis Pump was frozen in the open position, causing the code to be generated.

See part #03 in this diagram:

http://realoem.com/bmw/showparts.do?...39&hg=16&fg=10
Thanks alot. So, this is what I got. I realized this thing was never plugged in. So I plugged it in and got P2401 and P2419. I bought a new LDP and without hooking it all up just plugged in the harness to see if it would run. Nope, same codes after clearing. I probed the pins on the harness connector and got steady 12v on power and 5 volts on the input/output wires. I don't get why this thing would be throwing these codes.

Plugging in the old and new LDP gave me P1429, P2401 and P2419. I only get P1429 with the LDP unplugged.

Last edited by ckeith; 09-22-2012 at 07:06 PM.
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Old 09-27-2012, 09:00 AM
ckeith ckeith is offline
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Location: Ohio
 
Join Date: Aug 2012
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Quote:
Originally Posted by ckeith View Post
Thanks alot. So, this is what I got. I realized this thing was never plugged in. So I plugged it in and got P2401 and P2419. I bought a new LDP and without hooking it all up just plugged in the harness to see if it would run. Nope, same codes after clearing. I probed the pins on the harness connector and got steady 12v on power and 5 volts on the input/output wires. I don't get why this thing would be throwing these codes.

Plugging in the old and new LDP gave me P1429, P2401 and P2419. I only get P1429 with the LDP unplugged.
So, there was probably dirt in the connector. I used White Vinegar and soaked the electrical connector for a minute or two, plugged it in and it's all working. I got AllData for bimmers and P1429 is a short to ground on the Heater, P2401 is a short to ground to the pump and so is P2419. After I read that, just soaked the connector and it is all good.
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