DPF/EGR limp mode dash lights

BRENNANB

MEMBER
2009 VOLKSWAGEN POLO
1.6L
4 CYL
TURBO
2WD
MANUAL
81,000 MILES

I have a 1.6 TDI and have error codes:

P040300 - Exhaust gas recirculation circuit - passive/sporadic

P245500 - Diesel particulate filter differential pressure sensor circuit high - passive/sporadic

The glow plug light comes on now and then sometimes flashing sometimes steady, Sometimes goes into limp mode have tried many motorway runs but nothing. Best way to fix this? Is the DPF triggering engine management light would a new DPF sensor and EGR delete sort this? Thanks

3 Replies

4DRTOM

MECHANIC
467 POSTS

Hello,

Yes, the DPF sensor could be triggering the code or a bad connection in the harness. Replacing that sensor may take care of it. You may have soot build up too that's triggering the code. Are you having performance issue when its not in Limp mode. How often is it going into Limp? Running some treatment trough it may help as well.
Tom

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Tuesday, August 25th, 2020 AT 9:18 AM

BRENNANB

MEMBER
2 POSTS

No not at all, if anything I have noticed it feels smoother which is odd. Just had a service too and I do tend to drive around 30 miles to work and then 30 miles back. It goes into limp mode every now and then like I said the glow plug light comes on every so often. Could be once every few days or every time I start. It seems to be random. I have tried Wynn's EGR cleaner adding to the fuel and also the spray into the air intake but nothing. I think the best bet would be replacing the DPF sensor and VCDS calibrating it?

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Tuesday, August 25th, 2020 AT 9:22 AM

4DRTOM