Good morning all. I have a 2015 Superb estate diesel. I noticed recently that  either when forgetting to turn off the automatic stop start button or when turning the engine off after a journey and the car is warm it won't start again sometimes for a good one or two minutes. This is obviously awkward when you are sitting at a junction and the world is stuck behind behind you. 

 

Does anyone have any ideas what the issue might be here please or if anyone has experienced a similar fault.  

Someone will probably know more things to ask you to check such as getting it scanned but if that was my car I’d probably replace the battery as it’s around the age it can go funky (if you’ve not replaced already)

DPF issue? I drive a petrol engine, so not a lot of experience other than reading about other people's problems. Do you do a lot of short trips? Would a lap around the M25 in fourth help? DPF replacement?

 

If the car was dead in the morning, I might suspect the battery, but not when dying while you're on a run.

Yes, short journeys often. Mine has only 54k on the clock. Mainly 5 miles, park few hours, repeat. Occasionally a long run.

 

as it happens was driving Watford to Leeds last weekend and it slipped into limp mode after kicking down. Had a yellow flashing yellow coil warning light. Got to destination, parked up, next morning good as gold and no warning light.

 

 

Hi. . That last comment you mention immediately above could be a boost leak, DPF issue raring its ugly head or a multitude of similar issues.

I'd have it scanned/diagnosed ASAP, to save the car leaving you stranded many miles away from home.

Good luck & please post your findings.

Sounds like classic DPF is to blocked by old baked on soot and unable to clean itself thoroughly during a regen 

 

Did you say car car was 7-8 years old with 54k miles, or about 7k per year.  Probably had too many short journeys and soot gradually built up over time.

 

Only solution when car can’t regen the DPF and only cleaning the new soot is to have DFP removed and cleaned by ceramex process (or similar) etc

Edited 28 November, 20223 yr by SurreyJohn

If the engine was running OK before shutdown then no way will a partially blocked DPF prevent it from restarting despite your claims of it being a "Classic" symptom.

 

An engine will start with a potato blocking the tailpipe!

Edited 28 November, 20223 yr by J.R.

I have the same problem. Pretty sure it is not the DPF. Any other thoughts? I’m thinking perhaps a dodgy thermal switch.

I have the same problem. Pretty sure it is not the DPF. Any other thoughts? I’m thinking perhaps a dodgy thermal switch.