Calling all e70 4.8l x5er's I can't figure this trouble code

[e70jane]

07 X5 4.8l w/49k mi with trouble codes, p3203/p1039/p1036. Real strange cause once I reset the code, the car drives fine. However, after a good few miles of driving, it comes back again. Hesitation when I accelerate; it's drivable but you must be real gentle on the accelerator. When all this starts to happen, the check light comes on at the next startup, and there you have those codes from above. Funny, I've been having to drive with a scanner next to me. And if my instincts are correct, this problem seems to happen particularly on hot days. There were a couple of instances where my car was just idling there for a while, and suddenly it jerked real hard, and you could even see the rpms fluctuate a little. It even died out once in the middle of an intersection. But I've researched and researched and found that some say it could be the ecu, but others say to replace the o2's or to clean out the maf. So far I've cleaned out the maf but with no positive results, and I've also replaced the post-cat o2's just last week, no go either. I'm wondering if I should replace the pre-cat o2's too. I found something interesting though, when new post-cat o2's were put in, I was able to drive it further before the problem came back. I wonder if that means anything?

[14thbmw]

Welcome to the forum; I’m guessing you really wanted to post this in the E70 forum, though.

[Qsilver7]

Can't find anything about a P3203 OBD II code...it doesn't follow the nomenclature for the 1996 OBD II federal mandate in regards to OBD II DTCs (diagnostic trouble codes). Double check to make sure it's correct....or perhaps its a manufacturer code or a code specific to the brand of reader you used.

• p1039 | CAR OBD CODES
• p1036 | CAR OBD CODES

[andrewwynn]

You posted on the E53 forum. I've had similar happen on my E53 and a reset from my iPhone kicks out or limp home mode. Those codes all seem to be related to emissions. At least one came up as shorted sensor wire (nox). Another some references to disconnected speed sensor. Use the hidden menu to make sure the computer is getting a speed signal. You may have a simple case of a corroded connector. (not saying it will be easy to figure out where it is ).


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[e70jane]

Originally Posted by andrewwynn

You posted on the E53 forum. I've had similar happen on my E53 and a reset from my iPhone kicks out or limp home mode. Those codes all seem to be related to emissions. At least one came up as shorted sensor wire (nox). Another some references to disconnected speed sensor. Use the hidden menu to make sure the computer is getting a speed signal. You may have a simple case of a corroded connector. (not saying it will be easy to figure out where it is ).


Sent from my iPhone using Tapatalk Pro

Sorry guys for posting on the wrong section. I was afraid it'll be the nox cause it's around 5 bills a piece, ridiculously expensive for a sensor. And I'll probably need to swap out both. If I recall, I researched that only diesel e70 comes with an extended warranty, 10yr or 100k if I'm correct. It seems like there's an issue with bmw nox sensors, particularly the x5's. With all the vehicles I've driven in the past, I've never had to deal with the nox sensor going bad, let alone I've only got 49k on the speedo. Shouldn't they normally outlast the life of the car?

[upallnight]

Originally Posted by e70jane

Sorry guys for posting on the wrong section. I was afraid it'll be the nox cause it's around 5 bills a piece, ridiculously expensive for a sensor. And I'll probably need to swap out both. If I recall, I researched that only diesel e70 comes with an extended warranty, 10yr or 100k if I'm correct. It seems like there's an issue with bmw nox sensors, particularly the x5's. With all the vehicles I've driven in the past, I've never had to deal with the nox sensor going bad, let alone I've only got 49k on the speedo. Shouldn't they normally outlast the life of the car?

If you only have 49K and the car is a 2007 you are within the 100k, 10yr warranty period. Why not bring it back to the dealer and have them deal with it. I'm assuming you have a diesel BMW since nox sensor are only on those engines.

Dealer will just bill BMW USA for the repair.

[e70jane]

Originally Posted by upallnight

If you only have 49K and the car is a 2007 you are within the 100k, 10yr warranty period. Why not bring it back to the dealer and have them deal with it. I'm assuming you have a diesel BMW since nox sensor are only on those engines.

Dealer will just bill BMW USA for the repair.

Wait a minute.. now that I didn't know. Only diesel's have nox sensors on them? Well I've been using regular gasoline during my last few visits at the gas station so I'm sure it's not diesel. But I'm surely not out of the woods just yet either because now I'm wondering have the cats gone bad. I checked another website where I inputted p1309 and here's what I got:

"When you fill your car with gas, the vapors in the tank get forced into a canister filled with activated charcoal. Also, on a hot day as the gas heats up and vaporizes, those same vapors push into the canister where they're stored. But the charcoal can only hold so much vapor. At some point it has to be emptied. The emptying process is called canister purge."

I did mention that my problem seems to happen particularly during warm weather so I'm now starting to lean in this direction. Just how do you replace the charcoal canister, or could it be that I should replace the canister purge, or some call it the fuel tank breather?

[upallnight]

Originally Posted by e70jane

Wait a minute.. now that I didn't know. Only diesel's have nox sensors on them? Well I've been using regular gasoline during my last few visits at the gas station so I'm sure it's not diesel. But I'm surely not out of the woods just yet either because now I'm wondering have the cats gone bad. I checked another website where I inputted p1309 and here's what I got:

"When you fill your car with gas, the vapors in the tank get forced into a canister filled with activated charcoal. Also, on a hot day as the gas heats up and vaporizes, those same vapors push into the canister where they're stored. But the charcoal can only hold so much vapor. At some point it has to be emptied. The emptying process is called canister purge."

I did mention that my problem seems to happen particularly during warm weather so I'm now starting to lean in this direction. Just how do you replace the charcoal canister, or could it be that I should replace the canister purge, or some call it the fuel tank breather?

I must spoken, nox sensors are used in gasoline engine with direct injection.

Sorry for the bad info.

[andrewwynn]

I would do more searching on the codes or even get the stealer to pull the codes and get a report. The advanced code readers fill in the blanks. Your time is worth $ so save yourself some effort and get a good Indy or BMW dealer to pull the codes when it's in chugga chugga mode they should be able to tell you exactly what part has failed. You can reset the code drive home and order the parts.

Searching for the codes did not show direct answers which is very rare. Usually a search on E53 P0xxx will show an exact cause and solution (usually at xoutpost). The lack of answers is a clue. The "usual suspects" are not red flag jumping out so as mentioned it could likely be a wiring problem.

[e70jane]

Originally Posted by upallnight

I must spoken, nox sensors are used in gasoline engine with direct injection.

Sorry for the bad info.

Ok, so all e70 x5's have nox sensors in them because they are all direct injection, no? Thanks for the advice on having the stealer check out the problem for me, as I'm sure it's worth the $80, but sometimes you hear about them horror stories on changing parts after parts and still the unsolved mystery.