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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 09-10-2013, 11:58 AM
DangermouseX3 DangermouseX3 is offline
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SES Light, P1434 and Secondary Air Pump

I haven’t had my car long, only three gas tank fill-ups to be precise. But I have an SES light on.

When I drove from the dealer, the tank was low, so I filled it at a gas station and drove around for around 300 miles without incident.

Right after the second fill up, I mean as I drove away from the pump, the SES (Service Engine Soon) light came on. Recalling other cars where the gas cap can be an issue I stopped and removed and refitted the car. It didn’t appear to be loose or anything, but I noted the warning on the cap about it being on correctly. SES light stayed on for a few miles and then went out. I put it down to “operator error”.

50 miles later, the light comes on again. I remove and refit the cap. Light goes off.

For the next tank and a half, this is repeated periodically. My wife is the main driver, so it seems an easy work-around. I debate just getting a new cap, but want to get the code pulled just in case. Then last week, she complains about the car idling really roughly, so I am thinking it is maybe a deeper problem.

So I commandeer the car this week to find out what is going on. Go to autozone and find three codes, but don’t know if they are current or past. Intend to disconnect battery tonight to clear them (as the AZ guy says he can’t).

P1434 – Secondary Air Injection Pump wiring - from what I can tell, this is related to vapors and emissions, but I have searched the RealOEM drawings and cannot work out where it is. Is it just another name for the pump under the gas cap, behind the RR wheel? I have heard this operating after I stop the car.

(I also have P0305 – misfire #5, and P0015 – cam sensor, but as removing and refitting the gas cap seemed to reset the SES light before, I am concentrating on P1434 first.)

Can some please verify the location of this Secondary Air Pump, please?
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  #2  
Old 09-10-2013, 12:31 PM
timarnold timarnold is offline
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Re: SES Light, P1434 and Secondary Air Pump

It should be mounted on the passenger side of the engine next to the abs oump


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  #3  
Old 09-11-2013, 06:23 AM
DangermouseX3 DangermouseX3 is offline
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Quote:
Originally Posted by DangermouseX3 View Post
Intend to disconnect battery tonight to clear them (as the AZ guy says he can’t).
Important lesson learned - don't close the hatch before reconnecting battery
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  #4  
Old 09-11-2013, 06:25 AM
DangermouseX3 DangermouseX3 is offline
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Quote:
Originally Posted by timarnold View Post
It should be mounted on the passenger side of the engine next to the abs oump
Passenger side?

After a bit more research I think I located it on the Left Side, i.e. the US drivers side, near the air filter. Or am I looking at the wrong thing?
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  #5  
Old 09-11-2013, 07:33 AM
Supercourse Supercourse is offline
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Quote:
Originally Posted by DangermouseX3 View Post
Or am I looking at the wrong thing?
The secondary air pump is a big can-shaped thing on the passenger side in my 2004.
Can't miss it. Black plastic top with hoses.
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  #6  
Old 09-11-2013, 09:45 AM
swampX3 swampX3 is offline
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location of sec air pump

the round thing with the sun beams on it.....to the left of the W in BMW

easy to work on.....drop the glove box ....pop the relay cover .....push on relay top to simulate running for several seconds
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  #7  
Old 09-11-2013, 11:27 AM
DangermouseX3 DangermouseX3 is offline
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Aha. Worked out the problem.

Mine's an 07/N52 so I have a whole lot of nothing on the passenger side:



and I'm not even sure it's on the drivers side now that I see the picture of it.

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  #8  
Old 09-11-2013, 01:41 PM
Supercourse Supercourse is offline
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So they dropped the secondary air pump with the N52 engine - maybe because the electric water pump can be so finely controlled for faster engine warmups.

I know these OBDII codes are just guidelines for diagnostics, but seems odd to have codes pointing to non-existent components.

Maybe time to focus on the other two codes?
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  #9  
Old 09-11-2013, 04:36 PM
Burning2nd Burning2nd is offline
Under the lift arms
Location: Under the lift arms
 
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Mein Auto: E39 540, E36 328is, E83x3
P0305 is way more impotent then the evap code
vacuum leaks?

you have a n52 it seems... how many miles?
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  #10  
Old 09-11-2013, 07:48 PM
DangermouseX3 DangermouseX3 is offline
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SES Light, P1434 and Secondary Air Pump

77k.

I'm thinking of getting fresh plugs and inspecting the coils, and air intake for splits while I am doing that.


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  #11  
Old 09-12-2013, 02:13 AM
Burning2nd Burning2nd is offline
Under the lift arms
Location: Under the lift arms
 
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Mein Auto: E39 540, E36 328is, E83x3
Inspect the coils...

Plugs is a Good idea.. But the Splits
on the intake and other hoses is probably your winner
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  #12  
Old 09-13-2013, 01:29 PM
DangermouseX3 DangermouseX3 is offline
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A little more research and on this forum I found a member who had a code reader spit out

P1434 Diagnostic Module Test Leakage Malfunction

which is slightly different from what I got at AZ and from the FAQ section of these boards

http://www.bimmerboard.com/forums/posts/517875



I understand that this is the pump at the rear of the car that I hear occasionally after I stop the engine. So also on my list is to check the tubing around here for leaks.
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  #13  
Old 09-13-2013, 02:42 PM
Supercourse Supercourse is offline
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Quote:
Originally Posted by DangermouseX3 View Post
...
which is slightly different from what I got ....
Completely different I'd say.

Your code relates to exhaust emissions during engine warmup, while the other one is about raw fuel vapours.

As Burning2nd said earlier, EVAP malfunctions don't affect how well your car runs, secondary air pump problems might a bit, but vacuum leaks and misfiring plugs certainly do a whole lot (that rough idle).

Yes, check the EVAP hoses for cracks and bad clamps, but often the leaks can only be found with smoke test equipment.

Last edited by Supercourse; 09-13-2013 at 02:43 PM.
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  #14  
Old 09-13-2013, 02:58 PM
joylove joylove is online now
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I also have P0305 – misfire #5, and P0015 – cam sensor.

Fix this.

Obviously always clear the codes when you get a new car and see which ones return, they could be 8 years old, but equally people sell cars when they are needing some work done, rather than afterwards. Naturally spending a few hundred clams on getting a new Crank Sensor or a set of coil plugs is less than losing ten large in depreciation in a year but hey ho.

Last edited by joylove; 09-13-2013 at 02:59 PM.
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  #15  
Old 09-13-2013, 07:25 PM
DangermouseX3 DangermouseX3 is offline
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SES Light, P1434 and Secondary Air Pump

That's what I have done. I cleared the codes but haven't made it back to AZ to see which are still there.
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  #16  
Old 01-04-2014, 09:34 PM
johnnyloops johnnyloops is offline
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Is there any update to the fix for P1434, were you able to fix this? I have the same code on an 07 x3
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  #17  
Old 01-05-2014, 07:59 PM
johnnyloops johnnyloops is offline
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A follow-up for folks searching for this issue. I was able to fix this on my 07 X3 by replacing the gas cap and waiting about a week for the code to reset.
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  #18  
Old 01-06-2014, 09:01 AM
DangermouseX3 DangermouseX3 is offline
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All I did was remove and clean the gas cap rubber seal with a cloth dipped in motor oil. There was no noticeable dirt, but it seems to have been enough to get a good seal again. Perhaps it has made it a little more flexible?

I was waiting to see if this cured the problem, but then forgot about it. Sorry.

Very occasionally, the SES light will come on, but by the time I get a code reader on it, the code has cleared itself.
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