Ecu fault

S.DUNN

Member
My 1.4 Petrol A2 has problems starting sometimes and stalls coming up to the lights or junctions! It normally starts straight away when warm and has yet to leave me in the lurch.I have bitten the bullet and check it into my local garage TC Garage LTD who specialise in Audi,VW,Skoda & Seat.
They have told me it is giving a strange fault code which has nothing to do with this engine fit? and now feel its an ECU change £414 plus VAT!!!! but still might not fix the snag!!
Has anyone had this and had to change an ECU!!
Regards
Steve.
PS ITs had x3 MAP sensors in its history!!

PS CODE IS 16407 BANK 2 CAM B EXHAUST POS ACTUATOR U/S????????????????????????????????
 
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Although a specialist, it sounds like the garage are clutching at straws a little - changing an ECU is an absolute last resort and only if you know it's the cause.

If you are anywhere near a diagnostic equipped member (look at the map) then I'm sure that we can give you a cheap second opinion before splashing out that kind of money.

Cheers,

Mike
 
Did they tell you what this mysterious "strange" fault code actually was? I have only ever seen 1 faulty ECU on any Audi and that was the result of a botched attempt to mod the turbo by fiddling with the chips (and strangely removing the boost sensor).
 
Fault code is 16407-Bank 2: Camshaft sensor B (Exhaust): Position Actuator Malfunction P0023-35-10 intermittant.
Four cylinder engines have one bank. i.e one row of 4 cylinders. V engines have two rows of cylinders ie Bank 1 and Bank 2. This is a four cylinder engine and therfore dosn't have a second Bank or exhaust cam sensor.....! This fault has been brought up by both VAG Com and the VAS5052 (genuine Audi computor) we have both. I have carried out a software scan to see if there is a software patch available from Audi Germany (we have the online link), and to date there is nothing availble. This is a difficult problem to diagnose as the faults relate to a non existant sensor fitted to a non existant Bank of cylinders!
The ECU fitted to the vehicle has a part number of 036 906 034EG which is now obsolete. The part number has now changed to 036 997 034AB with no reason for the number change given on the parts cataloge. May be they had problems with the old number and have produced a modified part? My next point of action is to check looms and plugs etc to ECU to make sure we have no water ingress or contact problems. Other than that, unless anyone else has any bright ideas, i think that an ECU change is my only option left...
Trevor @ TC Garage 'clutching' at 30 years of Audi experience not straws.........!:)
 
Hmm, I see your point! I did hear of an A2 which had a hole in the floor immediately beneath the ECU - which obviously allowed water/gunk into that area, might be worth checking...

I'm sure Mike and Spike will have additional thoughts.
 
Hi Trevor and thanks for the clarification of the fault codes.

My clutching at straws comment was it seems misplaced in this instance - it was based on the fact that most garages would just change a box rather than work out another way, often cheaper to the customer.

However, even in this case, I would have thought that the loom to the cam sensors should be checked first as there may be a checksum error within the ECU that is reporting bank 1 as bank 2, so giving you the bum steer.

Interestingly, that ECU part number is being shown as still available on my system and also with my local dealership, priced at just over £400 plus VAT.

As Dan says, there have been instances of water ingress to poorly sealed units and yes, there was one A2 that I came across with a 2" hole punched through the footwell (DrJones!), but I think that would have been spotted by now!!

My money is on a cam sensor or the associated wiring within the head and this is certainly a cheaper option.

Cheers,

Mike
 
Hi Mike,
I'm with you on the point of what most 'garages would do'-Which is one of the reasons i set up my garage years ago to try and offer a specialist service. We enjoy a challange! Intererstingly although orginal ECU part number is obselete Audi still have a couple of old units in stock-not a good idea to fit that number if there is an updated unit. Your quite right with your suggestion to check cam sensor, ECU and wiring etc (our normal procedure before we rush in to a suspect ECU problem). I just thought that it was worth a mention as somebody might have come across this fault before we start spending chargeable hours on the job-thus saving on diagnostic time and therefore expense to the customer. It's certainly not one i've come across before! Nothing for it-but to start checking wiring etc...
 
I know that there have been checksum errors in ECUs before and that also, the wiring in the head can be suspect, certainly on the injectors, so would assume that to be the first port of call.

Do you have a date of the part being dropped and replaced by any chance? I suspect that a recent replacement would be for reasons of manufacture, not internal differences.

Cheers,

Mike

PS It's good to know that there are still thorough and decent guys out there - thanks for taking the time to register here and contribute.
 
heya
i have got ecu fault on injection number 2 is any one know where the ecu can be repaired?
thx
bahati
 
Sounds more like the head wiring to injector 2 needs repairing to be hinest, but there are specialists who could repair certain ECUs. Why not try one from a breaker, or off the bay?

Cheers

Mike
 
Fault code is 16407-Bank 2: Camshaft sensor B (Exhaust): Position Actuator Malfunction P0023-35-10 intermittant.
Four cylinder engines have one bank. i.e one row of 4 cylinders. V engines have two rows of cylinders ie Bank 1 and Bank 2. This is a four cylinder engine and therfore dosn't have a second Bank or exhaust cam sensor.....!

Sorry I don't have any constructive comments but in a similar vein, I asked our service engineers at work (diesel engine manufacturer) about spurious fault codes. They said its not uncommon to see logged fault codes which are not related to the engine being checked. Normally reloading the same calibration, or the latest update if there is one, cures the problem. This is all very easy in our factory enviroment but I don't know if this is feasible on our A2's.

Cheers Spike
 
Sorry I don't have any constructive comments but in a similar vein, I asked our service engineers at work (diesel engine manufacturer) about spurious fault codes. They said its not uncommon to see logged fault codes which are not related to the engine being checked. Normally reloading the same calibration, or the latest update if there is one, cures the problem. This is all very easy in our factory enviroment but I don't know if this is feasible on our A2's.

Cheers Spike

does anyone know the outcome of the above code as ive the same on my 1.4 petrol. car runs ok but in fed up with the engine managment light coming on.
 
I have a 1.4 petrol in an Audi garage currently awaiting a new ECU to arrive from Germany on Christmas Day! cost £883, so your price sounds good to me!
This started with a throttle body motor failing (£650), then a thrust sensor being replaced that made no difference, then a software update to widen tolerances, no difference and now ECU. Lets see if that does it!
 
Did this issue get resolved?

Cheers.

Fault code is 16407-Bank 2: Camshaft sensor B (Exhaust): Position Actuator Malfunction P0023-35-10 intermittant.
Four cylinder engines have one bank. i.e one row of 4 cylinders. V engines have two rows of cylinders ie Bank 1 and Bank 2. This is a four cylinder engine and therfore dosn't have a second Bank or exhaust cam sensor.....! This fault has been brought up by both VAG Com and the VAS5052 (genuine Audi computor) we have both. I have carried out a software scan to see if there is a software patch available from Audi Germany (we have the online link), and to date there is nothing availble. This is a difficult problem to diagnose as the faults relate to a non existant sensor fitted to a non existant Bank of cylinders!
The ECU fitted to the vehicle has a part number of 036 906 034EG which is now obsolete. The part number has now changed to 036 997 034AB with no reason for the number change given on the parts cataloge. May be they had problems with the old number and have produced a modified part? My next point of action is to check looms and plugs etc to ECU to make sure we have no water ingress or contact problems. Other than that, unless anyone else has any bright ideas, i think that an ECU change is my only option left...
Trevor @ TC Garage 'clutching' at 30 years of Audi experience not straws.........!:)
 
Fault code is 16407-Bank 2: Camshaft sensor B (Exhaust): Position Actuator Malfunction P0023-35-10 intermittant.
Four cylinder engines have one bank. i.e one row of 4 cylinders. V engines have two rows of cylinders ie Bank 1 and Bank 2. This is a four cylinder engine and therfore dosn't have a second Bank or exhaust cam sensor.....! This fault has been brought up by both VAG Com and the VAS5052 (genuine Audi computor) we have both. I have carried out a software scan to see if there is a software patch available from Audi Germany (we have the online link), and to date there is nothing availble. This is a difficult problem to diagnose as the faults relate to a non existant sensor fitted to a non existant Bank of cylinders!
The ECU fitted to the vehicle has a part number of 036 906 034EG which is now obsolete. The part number has now changed to 036 997 034AB with no reason for the number change given on the parts cataloge. May be they had problems with the old number and have produced a modified part? My next point of action is to check looms and plugs etc to ECU to make sure we have no water ingress or contact problems. Other than that, unless anyone else has any bright ideas, i think that an ECU change is my only option left...
Trevor @ TC Garage 'clutching' at 30 years of Audi experience not straws.........!:)
Hey mates, how did you solve this problem? I ran into the same... yesterday my voltage regulator went off, no charge. I used the car for 12kms without charging, lots of lights came on due to low voltage but I made it to home. I bought a new regulator, installed it. I cleared all fault codes, went for a 5 km circle. The charging was ok but came this: 16407-Bank 2: Camshaft sensor B (Exhaust): Position Actuator Malfunction P0023-35-10 intermittant. I have no idea what to do. 🤔
 

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Hey mates, how did you solve this problem? I ran into the same... yesterday my voltage regulator went off, no charge. I used the car for 12kms without charging, lots of lights came on due to low voltage but I made it to home. I bought a new regulator, installed it. I cleared all fault codes, went for a 5 km circle. The charging was ok but came this: 16407-Bank 2: Camshaft sensor B (Exhaust): Position Actuator Malfunction P0023-35-10 intermittant. I have no idea what to do. 🤔
As most of the posts here were a decade or more ago there are relatively few people who could reply.

I encountered the Camshaft bank 2 intermittent error last week for the first time with our AUA that I've been caring for over the past 6 years. It was a day when there were cold weather conditions, and it appeared to correlate with a brief voltage drop just after starting up (this is a long-running issue with this car so I'm getting ready to replace the alternator with a refurbed one). I do have a camshaft position sensor ready and was thinking of swapping it, but as the error has never appeared previously, and arose when there were all the other signs of a voltage drop upsetting various ECUs, my instinct is that this error is probably spurious and related to low charge state in our case - and I note that you had an alternator failure in the run up to the problem.

Try giving the battery a good overnight charge (with an intelligent charger like a CTEK or similar, maybe in re-conditioning mode if the battery was hammered when the alternator gave up), then clearing the error, then running the car and see if it comes back.

As commented above, also have a look to see if there is any obvious damage to the wiring or corrosion in the camshaft position sensor connector or sensor pins (on top of the engine rocker rear-most cover, back right hand side inboard of the coil pack).
 
As most of the posts here were a decade or more ago there are relatively few people who could reply.

I encountered the Camshaft bank 2 intermittent error last week for the first time with our AUA that I've been caring for over the past 6 years. It was a day when there were cold weather conditions, and it appeared to correlate with a brief voltage drop just after starting up (this is a long-running issue with this car so I'm getting ready to replace the alternator with a refurbed one). I do have a camshaft position sensor ready and was thinking of swapping it, but as the error has never appeared previously, and arose when there were all the other signs of a voltage drop upsetting various ECUs, my instinct is that this error is probably spurious and related to low charge state in our case - and I note that you had an alternator failure in the run up to the problem.

Try giving the battery a good overnight charge (with an intelligent charger like a CTEK or similar, maybe in re-conditioning mode if the battery was hammered when the alternator gave up), then clearing the error, then running the car and see if it comes back.

As commented above, also have a look to see if there is any obvious damage to the wiring or corrosion in the camshaft position sensor connector or sensor pins (on top of the engine rocker rear-most cover, back right hand side inboard of the coil pack).
Thanks Robin for the detailed description. As I wrote I ran on low board voltage for about 30 mins as I had no charge. Now charging is ok, after a short run the battery is at 11.9V, maybe its not enough, so I'm giving it a good charge and come back with the results.
I hope it's going to work both for you and me.
I'll be happy to hear about your case's progression.
George
 
I'd suggest de-, installing VCDS, downloading a fresh copy of, then reinstalling. The Bank 2 mystery could be that the label file, (where the text comes from), is corrupted, so incorrect text is being used. Probably not, but it's free.
Mac.
 
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