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55 plate laguna 130 dci check injectors and DPF light

10K views 27 replies 6 participants last post by  jamiepm 
#1 ·
Hi all,
Over the past week the car has been indicating a 'check injector' message which after a few minutes went out. Whilst it was lit the car was gutless, but sprung into life again once the message disappeared. However today I've had the DPF symbol light up as well. My daily commute is 80 mile each way up the motorway, with the car mileage at close to 120k,and driving home tonight hasn't resolved the issue. I have a code reader which is indicating a P1431 fault, but before I condemn the DPF to remap/software delete is there anything I should check?

Thanks Jamie
 
#3 ·
Hi Noel,
I have recently serviced (less than 500 miles ago) the car including carb cleaning the EGR unit, but the check injector message was present before I had serviced it. I'll take it out now and make sure it is still clean and that the EGR isn't seized as when I cleaned it last week all appeared normal


PS what do you mean regarding the pipes to the DPF.

Thanks Jamie
 
#5 ·
Also I'm getting P0235 fault as well, which I'm led to believe could be either the pipes to the DPF arrangement or the MAP sensor.

So is the problem in fact, the pipes to the DPF that are 'shorting' which is triggering the check injector fault, and now because of the daily mileage I do has part blocked the the DPF as the car isn't running 'normally'??

Any takers

Cheers Jamie
 
#7 ·
The code you have is generic so may be totally misleading. Renault use a different protocol in their ECU and very few code readers are Renault specific. In other words you are not much wiser as to what is wrong. The PO235 codes refers to inhibited air intake but you know that already as the ECU has gone into limp mode.

The DPF has two sensors - one on the entrance side and one on the exit - thay measure the pressure differential between ingoing gas flow and exiting flow. On some models there are two small bore pipes going to these sensors and they are known to fail. Should they leak then the ECU will detect a large differential and automatically throw up a fault.

On the other hand maybe the DPF has come to the end of its life.
 
#8 ·
Well driving home today the spanner symbol and check injector message went off! And normal service was resumed albeit the DPF light remained lit even after a 70 mile motorway run. Bizarrely when I first started the car there was a hissing sound coming from somewhere close to the DPF unit, but when I arrived home an hour or so later the noise had gone. So I don't know if it was a gasket issue or something specific to the pipes you mentioned on the DPF unit. I'm waiting now to get the codes read concisely and take it from there, but I think I'm going to get the DPF and EGR disabled to save pian in the future, as I've heard the DPF light won't go off without Renault tech wanting an amount of money that I can simply put towards the remap work. Also noting that this is a fault starting appear across our cars i'll post up the particulars on the resolve so it may help others in the future

Cheers Jamie
 
#13 ·
Mine was doing all of quoted post until the final day where I just lost all power. Fortunately I was only 5 miles from home so limped back. There was no oil or smoke before this. Everything that is happening with you is exactly the same as what happened to me. Try not to do too many miles until its checked
 
#16 ·
well can clip is indicating 'turbo boost pressure sensor' incoherent signal. So I've ordered a new MAP sensor, which I'll fit tomorrow and then report back progress. Quick question is I presume an aftermarket unit (Intermotor type) will be ok in lieu of the original bosch unit, also its the 4 pin sensor and not the 3 pin type

Regards Jamie
 
#17 ·
MAP sensor fitted, car drives as it should, however DPF light is still yet no codes displayed.the Can clip stated last FAP regen was around 81000 miles but car is now on 116000 miles. Is there a 'special reset' needed of the ECU or am I missing something?

Cheers Jamie
 
#19 ·
Could be the DPF is blocked. I'm not sure if it was 2005 or 2006 that the smoke test limits changed. If it's 2005, removing the DPF will probably cause an MOT fail. I removed dpf on a 206 1.6HDi and the smoke test went from 0.4 to 2.0. Other thing to watch is that with the DPF removed, the turbo spins up more freely and you could end up with gearbox issues as the power increases due to overboost.

Not sure on the laguna, but for my 1.9 grand scenic, a new DPF is 'only' £250. The 206 I modded cost over £450. Maybe the renault clip tool can force a regen ?? The DPF's are normally expected to need replacing by 100k miles.

Only other thought is BP ultimate diesel. It seems to be brilliant at clearing through injectors and other issues. Give it a quarter of a tankful and see.

The two pipes from the DPF sometimes get condensation in them which can get into the pressure sensor. This can give a false error. They should be looped so that the pressure sensor is higher than the dpf take off points, otherwise any condensate runs into the sensor. Try taking them off and blowing them through.

My gut feel is a truly blocked DPF.
 
#20 ·
On some cars you can try to force a regen by keeping in lower gears and keeping the revs up to get the exhaust nice and hot. Doesn't do the economy any favours but might keep the DPF going a little longer.

Some of the faults clear if the battery is disconnected for a while. Make sure You've got the radio code beforehand though ...
 
#21 ·
My daily commute is over 150 motorway miles , so I'll know by tomorrow night if a long run will sort it. I'll have a chat with the guy who does my MOT to clarify smoke levels as I can get it DeDPFed,EGR disabled and remapped for £200, if I'm not going to have a smoke test issue.

Cheers Jamie
 
#22 ·
Well the car drives 'normally', however DPF light hasn't gone out and the check injection message has returned.however I now have a new generic code of P2002, so back to can clip on Friday to confirm. What I find puzzling is that in the space of 250 miles my car has gone from totally problem free to what appears to be a screwed DPF.

Jamie
 
#26 ·
Initially my MAP sensor had failed which triggered 'limp mode/check injection message'. Then because I continued to drive the car it caused the DPF to block as limp mode isn't DPF friendly. So firstly replaced the MAP sensor and decided to check the DPF assembly and found that the vacuum pipes at each end of the DPF were perished due to exhaust heat, so I simply trimmed the bad sections of pipe off and reconnected to the DPF.since doing this the car has driven perfectly

Jamie
 
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