Codes P1421, P0420, P0430 - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 10-17-2005, 04:07 PM
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Codes P1421, P0420, P0430

OK, getting down to serious diagonistics on the Bimmer. Last go around I had the following codes:
P1421, 0420, and 0430.

Hamfisted, recommended checking the vacuum lines for leaks. I've done this and replaced a few that were brittle but did not see any that were definitely leakers.

I did pull the Air Pump Control Valve and cleaned it. I tried pulling a vacuum on it with it off the car to see if it operated. It did not.

Could this be causing a problem with air being introduced to the car during start up and throwing the P1421 code?

I checked the board for P1421 and resolutions but the 3 hits only got me as far as how to read the codes, no real mechanical stuff going on there.

Where next?

Lar
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#2 (permalink) Old 10-17-2005, 05:18 PM
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Bank 1 plumbing ?

P1421 - Secondary Air System Bank 1


The code is specific enough to narrow it to Bank 1. No vacuum leaks, on to the next step. The forward oxygen sensor for that bank triggers that code. How old are the oxygen sensors? If you don't want to buy new sensors right away try swapping the two forward sensors and see if the code moves the the other bank (P1422).






Mike

Last edited by Hamfisted; 10-17-2005 at 05:36 PM.
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#3 (permalink) Old 10-17-2005, 09:06 PM
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Getting ready to head to Houston until Saturday but will hopefully be online there.

For my ignorance, how does the Bank 1 and Bank 2 break down on the E36, M50? (it is M50, right?)

I knew you might ask about the age of the O2 sensors and I'll give you one guess, ......................................OE. I've been putting off the $120 each but it looks like its time to pay the piper so to speak.......

Regarding the vacuum lines, BMW'r doesn''t use too many. I replaced the one going to the Air Pump Control valve from the hard line in front of the timing chane cover and from the other end to the relay and from there to the canister. Did not see any others that looked bad, shot it with TB cleaner and no notable change to engine. Therefore, assume all is well re vacuum.

I'd put $ on the O2 sensor(s)...............I've heard its recommended to replace all 4 at once, correct?

PS.............no leaks yet on the T-stat housing gasket replacement.

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