Leon 170 BNM DPF issues

[RichyFR]

Hi all,

I'm having a bit of a nightmare with the DPF in my Leon. Recently it started a regeneration more and more frequently and some of the times the light would come on.

Last few times it did it, it went into limp mode (flashing coil) but I managed to get it going again by carrying on driving. Apart from the last time I did it....

I scanned the car myself and it came back with a P2002 error code (https://www.obd-codes.com/p2002). A bit of googling and I found that it could be the exhaust pressure sensor.

I decided than rather than playing around, I'd take the car to a "DPF specialist" to get it fixed. About 6 hours, an EGR clean and a lot of fiddling he had the car regenerated, which apparently turned out to be just a wire.

I drove the car home and about 10 minutes into my 30 minute journey, I could feel it... the car was going to start a regen. I thought that it was a bit odd, seeing as it had just been regenerated.

Needless to say, I drove it home on a 40 minute drive, with very little slow speeds/stopping, normally it would've finished the regen.

I took out out for a 20 mile drive (dual carriage way) at 2.5k in 4th gear to 'force' a regen but that didn't work. The next morning on my way into work, it failed and the DPF light came on.

I phoned the garage and they said to take it for a drive, when I said I had already he responded with he'll have a think about it and get back to me (Thursday), now Saturday I've got nothing.... my car went into limp mode on the way home the same day.


Fed up, and feeling completely ripped off I went to my local motorfactor and bought a new exhaust pressure sensor and installed it today, took it for a drive but it isn't even trying to regenerate.

Interestingly, if I disconnect the sensor, the flashing coil stops and the car is no longer in limp mode - the car tries to regenerate as expected (but no pressure sensor means failure).

Could it be one of the other sensors? The P2002 code is still present on my ECU.

Car is a 2006 (56) Seat Leon MK2 170 BNM with 130k on the clock.

Thanks in advance!
Rich

 

[R3k1355]

What does live data on VCDS tell you about the DPF, how full is it and stuff?

Have you pressure tested the intake system to check for boost leaks?

 

[RichyFR]

What does live data on VCDS tell you about the DPF, how full is it and stuff?

Have you pressure tested the intake system to check for boost leaks?

Hi, I’m having a bit of trouble getting hold of someone with vcds who knows about dpf.

I’ve been told that there’s a local garage close by who has vcds, so my plan is to try them for a detailed dpf scan in the week.

I’ve checked my air filter, seems OK but I’ve not tested the entire intake for leaks - not sure how to do that.

 

[R3k1355]

Needs pressurising, maybe that garage would have a kit.

If you've got leaks in the system you can run rich and foul up the DPF, fairly common for the intercooler to develop a leak around the end-tanks.