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E90/E92/E93 M3 (2008 - 2014)
4th generation E90 M3 sedan, E92 M3 coupe and E93 M3 convertible. The last of the naturally aspirated M3s, powered by a 4.0 liter V8 making 414hp and 295 lb-ft of torque.

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  #1  
Old 03-31-2013, 03:42 AM
darsh_e92m3 darsh_e92m3 is offline
Darsh_e92m3
Location: Edgware
 
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Mein Auto: E92 M3
Check engine light reoccurrence

Hi, Iv got a 2008 e92 m3 with 46k miles on the clock based in the UK.

It's still under warranty and owned only for 4/5 months.

The problem is that the check engine light comes on whenever I do a motorway/highway run (Driving at around 70/80mph for a long period of time i.e 40 minutes to an hour.

The fault always reads that the O2 sensor needs replacing (which has already been replaced..twice!!)

It's very consistent and only ever comes on during a motorway run.

It's been in and out of the garage but the BMW garage don't know what the problem is..!!

They're over reliant on computer testing an the faults keep bringing up the same problem so now they're stuck.

Ha anyone else ha problems similar to this?

History of problems below:

- engine light came on due to low fuel when I first bought the car (wanted to test the range after 0 miles of fuel)

- MPG is always around mid 16 mpg regardless of how sensibly I drive. High fuel consumption??

- 3 times on the motorway over 2 months with O2 sensor fault codes.

- car has NEVER gone into limp mode (reduced power)

- It has had a gearbox (was notchy/crunchy), clutch and flywheel changed under warranty (apparently) by the dealer, so all these parts are NEW!

- it has a Hayward and Scott upgrades exhaust system for better sound.

Can someone that had problems in this area help if they've managed to get over the problem?

Car drives fine other then the CEL affecting it.

Darsh
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  #2  
Old 03-31-2013, 03:47 AM
darsh_e92m3 darsh_e92m3 is offline
Darsh_e92m3
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  #3  
Old 03-31-2013, 01:30 PM
FlyingLow78 FlyingLow78 is online now
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Location: North Carolina
 
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Mein Auto: 2015 M3
Hi darsh,

I'm normally in the UK as well, though I'm away at the moment. I get around 16 MPG as well.

The cause of the O2 code could very likely be because of your aftermarket exhaust. A few questions:

1. Does the exhaust replace the OEM catalytic converters? If they are not present you will fail the catalyst efficiency test.

2. Which O2 sensor is indicated as failed? More than one? Before or after the catalysts?

3. If you look at the instructions here: http://az79640.vo.msecnd.net/akrapov...9ed6beec75.pdf

On page 19 it shows a spacer which may be required on your installation to keep the CEL from illuminating. Compare that to the image of the stock installation on page 13. It's a cheap fix and worth a shot if you don't already have them.
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Last edited by FlyingLow78; 03-31-2013 at 01:37 PM.
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  #4  
Old 03-31-2013, 08:24 PM
darsh_e92m3 darsh_e92m3 is offline
Darsh_e92m3
Location: Edgware
 
Join Date: Mar 2013
Posts: 7
Mein Auto: E92 M3
According to service guy at BMW, both sensors on bank 2 were replaced (before and after the cat) at different times yet after a couple of drive cycles the cel comes on with same fault code.

I'm not sure about the spacers as it was fitted before the purchase but il defo let technician know about this as they seem a bit clueless.

Il get the exact history of the problems an post them but all faults have been related to the sensors before and after the cat.

At the moment they have told me there seems to be a few irregularities with the engine harness wire after they checked it.

Il update this on Tuesday evening as to how things stand.

Thanks for the help fella!

Darsh
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  #5  
Old 03-31-2013, 10:38 PM
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jfox335i jfox335i is offline
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If you're getting 16, you're doing great. I struggle to get over 14, price we pay for that sonorous V8.
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  #6  
Old 04-08-2013, 10:41 AM
darsh_e92m3 darsh_e92m3 is offline
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Iv been told that they have ordered a DME unit as BMW has advised that can be the only thing.. I'm not convinced but lets see
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  #7  
Old 04-09-2013, 02:48 AM
Candide13 Candide13 is offline
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Quote:
Originally Posted by jfox335i View Post
If you're getting 16, you're doing great. I struggle to get over 14, price we pay for that sonorous V8.
I wonder, Imperial gallons are larger than US gallons, so 14 mpg in the US are more like 17 mpg UK. So 16 mpg UK does sound a bit low, unless you drive in heavy traffic all the time. Perhaps OP used US mpg , of course.
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  #8  
Old 04-15-2013, 08:51 AM
darsh_e92m3 darsh_e92m3 is offline
Darsh_e92m3
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After waiting 2 an a bit weeks to get the car back, 30 mins into the drive, a bit of gas and surprise surprise.. The lights back on..

Fed up now.. Want to get rid of the car now.. can't be arsed with this constant headache
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  #9  
Old 04-15-2013, 09:04 AM
FlyingLow78 FlyingLow78 is online now
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As a last ditch effort, consider trying the spacers for the oxygen sensors on that bank. They're cheap and easy to install. Any exhaust shop could do it in 5 minutes.

Sorry to hear it's still giving you problems. Did they ever tell you exactly what fault codes were logged?
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Last edited by FlyingLow78; 04-15-2013 at 09:05 AM.
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  #10  
Old 04-15-2013, 01:09 PM
darsh_e92m3 darsh_e92m3 is offline
Darsh_e92m3
Location: Edgware
 
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Mein Auto: E92 M3
Il get a report and upload it.

Iv told them about the spacers and they said they'll have a look but I don't know if they bothered.

I think it might be worth a shout contacting Hayward and Scott (the manufacturers of the the exhaust)... I don't know.. Running out of options
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  #11  
Old 04-16-2013, 09:31 AM
FlyingLow78 FlyingLow78 is online now
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I'm curious to see exactly what codes have been logged. *patiently waiting*

The whole point behind the O2 sensor spacers is that it reduces the sensitivity of the sensor, so it doesn't trip for momentary out-of-tolerance conditions. If the BMW shop is unwilling to put them on (because they don't think you need them), then go somewhere else that will. As I said, a simple exhaust shop can do the job in 10 minutes.

If the fault code has been p0420 or p0430, it indicates catalyst efficiency below threshold, and I would start with a spacer on the affected bank's rear sensor first.

There's a reason Akrapovich specifies their installation with one of their exhausts....
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  #12  
Old 04-16-2013, 09:42 AM
FlyingLow78 FlyingLow78 is online now
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I did a bit more research on the O2 sensors and the rear sensor is designed to see a very constant amount of oxygen content at the rear of the cat, versus the front sensor which is designed to see a cyclic amount as the ECU varies the injector pulse. You may have one catalyst that has a marginal performance, but tests good in the shop, and (possibly due to the cost) BMW is unwilling to diagnose it as faulty.

Adding a spacer to the rear sensor will pull it out of the exhaust stream, where it's less likely to detect these slight out-of-tolerance conditions. For a few pounds, it's a very likely cheap fix.

If you're logging a p0420/p0430 after that, though, a new catalyst is in order.
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  #13  
Old 06-03-2013, 02:58 PM
darsh_e92m3 darsh_e92m3 is offline
Darsh_e92m3
Location: Edgware
 
Join Date: Mar 2013
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Mein Auto: E92 M3
Check engine light reoccurrence

FINALLY!!!!! after 6/7 months of this problem, they replaced the full wiring loom and its now solved it!!!

Unbelievable as they changed the DME and tested the wiring..!!!

They also refunded me 3 months worth of financing which is good!!

Thanks for the info guys but as long as mechanics are now just using computers to diagnose faults then these problems will continuously happen..!!

Still don't understand how it was a wiring loom issue


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