[Dickisafc]

He said that there was a few error codes so he reset it and I left it over night it did not make the usually noise on the morning so I assume it was due to being kept inside over night. The nox was flagged up on his BMW diagnostic machine and he told me that it would be about £400 however it would not affect the engine it I did not do it straight away I was unsure of how this could be causing the problems as I thought it could have been a coil pack etc I appreciate the advice

[Drrncour]

Well as the hpfp is a common fault. I bit the bullet and bought the Nox sensor and the high pressure fuel pump seeing as they both came up on the bmw diagnostics. Cost me £520 for both parts inc bmw discount. And my indie is going to fit and reset all codes for £100.

So £620 all in (better then the £1600 bmw wanted) and at least I have piece of mind don't want either exp fuel pump to fail down the motorway or when my 3 year old is in the car

[KM79]

Originally Posted by Dickisafc

He said that there was a few error codes so he reset it and I left it over night it did not make the usually noise on the morning so I assume it was due to being kept inside over night. The nox was flagged up on his BMW diagnostic machine and he told me that it would be about £400 however it would not affect the engine it I did not do it straight away I was unsure of how this could be causing the problems as I thought it could have been a coil pack etc I appreciate the advice

The nox sensor does have a large bearing on engine running.This 'jerk then all is well ' is the car trying to run in stratified mode, the nox sensor is faulty , then then the cars DME disengages stratified mode to prevent damage.As I said before these are very common and when there's are nox faults the sensor should be changed ASAP.

[Dickisafc]

Originally Posted by KrisM79

The nox sensor does have a large bearing on engine running.This 'jerk then all is well ' is the car trying to run in stratified mode, the nox sensor is faulty , then then the cars DME disengages stratified mode to prevent damage.As I said before these are very common and when there's are nox faults the sensor should be changed ASAP.

Will get staright on it in the morning, I just wanted reassuring I wasnt chucking my money away (for a change)

[Dickisafc]

Had the car back to the garage and found the fault codes

2af4 nitrous oxide sensor electrics
2af2 nitrous oxide sensor lambada linear
2af6 nitrous oxide sensor lambada binary
2a99 crankshaft ute let correlation
nitrous oxide sensor heating
2af0 nitrous oxide sensor hearing

He thinks they are all linked to the nitrous oxide sensor hopefully this is the case

[Drrncour]

Just got my motor back. Wow what a difference in the car now. Ended getting a few extra bits done. Replaced Nox Sensor, replaced high pressure fuel pump, had all adaptations reset and codes and had the 6 inlet valves walnut blasted.

All these has led to a new machine, very happy even if my wallet isn't.

Walnut blasting - £255 (Vines Bmw)
Fit high pressure fuel pump - £170 (inlet manifold ect has to come off, vines bmw)
Fit Nox Sensor £45 (independent)
Reset adaptations £55 (vines bmw)
Total cost of parts £520

Oh and vines have me £49 for my old hpfp. :-)

[Drrncour]

Originally Posted by Dickisafc

Had the car back to the garage and found the fault codes

2af4 nitrous oxide sensor electrics
2af2 nitrous oxide sensor lambada linear
2af6 nitrous oxide sensor lambada binary
2a99 crankshaft ute let correlation
nitrous oxide sensor heating
2af0 nitrous oxide sensor hearing

He thinks they are all linked to the nitrous oxide sensor hopefully this is the case

Hopefully. It's cheaper to buy the part from bmw (ask for discount they do give it, I got 10% off) and then pay an independent to fit. (Although still have to pay to have codes re read ect)

[Dickisafc]

Just had the nox sensor changed for £460 yesterday today same problem with car took it back said the timer change had stretched so would need new one with ratchets rails etc. Another £530 can't believe it

[Drrncour]

Had mine changed also and the hpfp. Also had the same issues, took it back and they said low pressure fuel sensor fault, so that cost me £230 as well. And guess what, still not running 100%!

[mikeoc1]

New to forum-my 320i on 19k 59 plate according to inde garage needs a nox sensor at £450.Have read threads -is it a must to get this done as the car is running smooth ? Just concerned about a faulty ems reading-any advice much appreciated.