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Discussion Starter #1
Hi there, I am having an absolute nightmare with my 307. It's a 2.0 HDi sport 2005 reg. my engine management light is on and has the message "depollution system faulty" come up on the screen. It runs fine but the turbo doesn't always kick in. It's been in and out of the garage for the last 2-3 weeks or so. They have had a guy with specialist equipment come out and spent around 8 hours in total doing various tests on it. He narrowed the issue down to a solenoid at the back of the engine, so they changed it, took it for a test drive and 5 mins up the road the light comes back on and the turbo cuts out! They are at a bit of a brick wall with it. The light is always on but its hit and miss if the turbo works or not. They said something about there being a vacuum that goes round to the back of the engine going in and an out vacuum. There isn't always a vacuum coming out but they can't work out why as there are no leaks that they can find. Has anyone else had this problem or heard of anything similar? I've only had the car just over 2 months and I really don't want to have to get rid of it.
 

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What faults were logged?

My theory is that your dpf is clogged up creating backpressure so the turbo solenoid logs an error message and the turbo cuts. Turbo solenoid faults are common with clogged dpf.

When was the dpf last serviced? Is there anything left in the eloys tank? 10 years old seems about right for dpf to need some tlc or changing.
 

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I'm going back to the garage tomorrow anyway so will run that by them. I'll find out what faults it was coming up with too. I Have no record of anything to do with the dpf. I'll let you know how I get on. Am pulling my hair out with this!
 

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I'm going back to the garage tomorrow anyway so will run that by them. I'll find out what faults it was coming up with too. I Have no record of anything to do with the dpf. I'll let you know how I get on. Am pulling my hair out with this!
"depollution system faulty" generally mean the dpf, or something related too it. I am sure the expert knows his stuff, so he started there. Anyway fault codes related to that message are often discussed around here, so either make a search for them or post them here.
 

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is it a 136bhp or 110bhp?

could be the turbo repeat sensor, you should ask for the fault codes as depollution system faulty could be anything DPF/FAP, MAP/MAF, EGR sensors ect

if they have been at it 8 Hours with specialist equipment then I would say two things they don't have a clue or they want the computer to show them where the fault is many garages use computers so they don't look have to take things apart, one guy told me diagnostic computers are only good if the person knows how to use it,

I would ask them to check the vac lines with a pump and see if there is any leaks in the system if there is then that could be your issue if the turbo needs lots off vac power and it cant get any this would cause limp mode and codes you should be looking for turbo too low or too high you might even get turbo repeat sensor code too
 

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Discussion Starter #6
It's the 136. They said that this guy who has the equipment tested the pipes but there was no leaks. I've been trying to do a bit of research myself and have seen a couple of people with similar issues and saying it was the turbo repeat sensor or to do with the egr valve. Also I spoke to a turbo specialist over the phone who said the same or could also be clogged up DPF. Just don't know what to do with it! It's driving me insane! One minute you have turbo, then you don't!
 

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Vicki,

I know how you feel with it mine was the same I had it to a few garages and they all said it was the turbo and few others told me that HDI engines have no turbos that was well before I learned more about these engines I have done a engine swap timing belts and discs clutches ect on my own car self taught.

if he said it was under boosting then it could well be the repeat sensor you can replace these on there own without removing the turbo I think a member on here done his and it was back to full power.

you could get the FAP/DPF checked to make sure its not blocked this could be done on planet diagnostic machine
 

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Thanks for the advice! I enjoy fixing things myself if I can. My dad helps me out a bit (stands and tells me what to do!). I had an issue with it jumping around a bit in low revs at 1st but managed to sort that by changing the fuel cap sensor. Just wish this problem was as easy!!
 
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