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Hello everyone,

First post. Richard, from the North East of England. My car is a Peugeot 207 1.6 GT Turbo 56 plate which I’ve had for just over one year.

A few weeks after I got the car (first occurred aprox 11 months ago), I experienced a “depollution system faulty” error on the dash. After reading some advice online, the air filter was changed and the car ran at a steady speed for 45 minutes. The error was then cleared using a non-Peugeot computer attached through the port in the glove box.

I should really have come on the forum at this point, since my understanding of cars is poor. Nonetheless, the error did not reappear and the car ran fine for the best part of a year, so I did nothing about it other than an oil change and the usual checks.

During the middle of last month, the car started stalling on deceleration. Essentially, the car runs and doesn’t cut out in idle or when travelling at speed, but it does seem to be struggling to maintain a fixed number of revs from what I can see (the needle seems to fluctuate as if the car can’t find the right rev level to remain at). Sorry that I can’t give a better description.
I had a mobile mechanic look at it as the car didn’t seem safe to drive (I was concerned it might cut out at speed, however, this didn’t actually happen, it only cuts out when breaking sharply after the revs dropped below a certain point under 2,000, regardless of gear). His diagnostic machine was reading “Fuel too rich” although there was no warning light on the dash. No reappearance of “depollution” related faults. He gave the car a service, changed the oil and fuel filter and reported this made no difference. The problem seemed to be over his head and he recommended I take it to Peugeot as their machine may read the specific code, he suspected “Fuel too rich” to be a generic (and unhelpful) error.

I checked it in to a Peugeot dealership 4 weeks ago who promised to take a look at it after I'd given them the history. I’ve had a hell of a time with them in regards their communication, not getting back to me, getting conflicting stories, etc. I’ll try and summarise the technical aspects and avoid getting into all that, though.

Dealership said the Peugeot diagnostic machine could not read from the ECU. Asked if I would be OK for them to download it to a computer (apparently there’s a 1 in 1,000 chance this can corrupt the system), which I approved.
They then phoned me to say they’d need to strip the engine down, worst case scenario would be “timing chain and tensioners”, and I’d be looking at a total bill of £670 inclusive of the diagnostic and ECU download. I approved this.

This didn’t work. I then approved a further 3-4 hours of “manual diagnostics” to try and get to the bottom of this since I had no idea what to do next and challenging them on their previous promise was getting me nowhere. Total bill now over £900 follow these further diagnostic checks.

They rang me at the weekend to ask if I’ve ever jumped started the car (unsure of relevance, but I haven't), but that in any case, the ECU needs replaced. This will cost £800 and when pressed if they are sure that this will solve the issue, they’ve said they can’t make any guarantees.

I’m really unsure what to do, an already costly bill is about to rise to £1,700 on a 56 plate car, and they don’t seem to be able to make any estimation of whether this will resolve my issue despite paying several hundred quid for different types of diagnostic.

I know there’s no magic answer here, but I'm hoping for some opinions from those that understand these things better than I do of what you might do next in my position. Stick with this dealership despite them taking 4 weeks to get to this point and getting very vague information from them? Take it elsewhere? Try and sell the car in the state that it’s in? Really appreciate any thoughts.

In the mean time, I’m hopefully meeting the “head tech” this afternoon/tomorrow to see a written report of what they’ve been doing for the last 4 weeks.

Cheers!
 
D

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First thing Im going to say is get the valve timing checked but obviously its all done. This BMW engine suffers from timing problems.

What were the specific fault codes and descriptions?

Sent from AutoGuide.com Free App
 

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Discussion Starter #3
Thanks. I didn't include this in my original description, but apparently the timings were checked prior to and after the timing chain and tensioner work.
 

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Discussion Starter #5
Assuming it was either fine or unreadable given that the next thing they want to do is replace the ECU.

Hoping that the report I'm getting will include error codes as I haven't been able to get any such information from them over the phone.
 

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Discussion Starter #10
OK, thanks both. I take it from that you'd be sceptical of the effectiveness of the work that I've had done and the suggestion to just replace the ECU?
 

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Discussion Starter #12
I've got the car back in exactly the same state I took it to the dealer in, but I'm now £640 lighter (after much debate, as the bill was actually £900). The P code they've given me (which they didn't include in the report, I had to ring up for) is:

P0172 - System too rich / fuel too rich

They've reported the following work:

1. Diag into lack of power and cutting out
2. Tested with pps mixture rich faults and super knock faults
3. Checked all connections, no faults found
4. Carried out compression checks to engine, found all at 14bar
5. Updated engine ecu to latest spec
6. High fuel pressure ok at 52bar/2000rpm
7. Carried out timing check
8. Replaced timing chain and tensions and new guides
9. Retest same fault but timing now set correctly
10. Carried out checks into air leaks, no fault found
11. Removed upstream oxy sensor, tested, same fault but no fault on either system, fuel pressure ok, valve timing ok
12. Extra work carried out foc due to poor repair, rerouted engine harness up and down stream oxy
13. Can only advise that next step is to try new engine ecu

Cheers.
 

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Discussion Starter #14 (Edited)
I wouldn't know where to begin with something like that. Back to a Pug dealer or is that something I could get someone on the forum to look at?

Failing that, might the ECU replacement be a logical next step?

I should add, the tech did seem very knowledgeable and thoughtful and said his estimate would be that replacing the ECU has 80% chance of working?
 

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Discussion Starter #16
The saga is still ongoing with this car.

I ended up procrastinating for 2 months and the car has just sat on the drive. I realised that the tax and MOT is due at the end of the month which has spurned me into action.

Went to unlock the car - dead as a door nail. Put it on a slow charge for 10 hours and it then started but displayed a ABS/EPS fault on the dash. Put this down to the battery being allowed to go flat and booked it in with a different Puegeot dealer.

They've done their own diagnostics and seem to agree with Dave that there's nothing wrong with the ECU. They've said there are two faults causing my issue:

1. ABS Pump - £1,378 to fix
2. Mixture regulation fault. Either sensor or wiring harness - £106.80 to fix

What do we think? I've asked them about just doing number 2. to see if that clear it and advised that the car has been on the drive for 2 months, but they seem to think both need done.
 

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Discussion Starter #18
It wasn't mentioned and it didn't occur to me to ask (since I didn't know there was such a thing). I'm getting a report from them tomorrow, if it's not there, is it something they should be checking before going further?
 

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Discussion Starter #20 (Edited)
Yes, it has been checked they say.

They've said they've gone as far as they can with mixture regulation sensor/wiring harness and the next step is to replace the ABS pump.

The ABS pump has a corrupt ECU and this is sending out garbled data to the other ECU's. The ECU of the pump and pump itself are one and the same, so the cost to replace and fit remains at £1,378.

Does this sound plausible and a reasonable cost?
 
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