Coil light flashing...help

[Benzy]

On my way down to Cornwall last night, cruising on the motorway, 50mph on the cruise control through road works. Road works finished and I accelerated up to 70 then all of a sudden lost power after coil light started flashing.

I pulled into a service station and there happened to be a break down like there, so I sweet talked him a bit and got him to scan the engine....no codes came up at all.

Turned the engine off then on again and everything was fine, no warning light and back to full power. :S

Any ideas and should I be worried? The cars a TDI FR and I have had the injector recall done

 

[LeonCR]

looks like it was saying you need to drive me a little harder

would have been a DPF regen indication, if it happens again just keep the revs about 2-2.5k for about 15 mins and it should be fine

 

[Benzy]

Ye I thought it was that and I gave it as many beans as it let me for about 30 miles till the service station. Never had a full on regen problem before, I do lots of motorway miles and always in 5th gear to keep the revs up

 

[AndrewJB]

Coil light usually means one of the sensors is on the way out


The car went into limp mode, it wouldnt go into limp mode if it was Regening


Probably The DPF Pressure Sensor

 

[LeonCR]

Coil light usually means one of the sensors is on the way out


The car went into limp mode, it wouldnt go into limp mode if it was Regening

yep sorry andrew is right I didn't read your post properly

i would give it a rag to clear it out then just keep an eye on it

 

[AndrewJB]

I would always drive it hard anyway to avoid stuff like this

I managed 2.5 years without any faulty Sensors, some cars have faulty sensors every month, bit of a lottery

Hook it upto VCDS you will probably see an error code to do with Signal Implausable to Sensor xxxx or something similar

 

[Benzy]

So will a Dpf delete remove this problem even if it is the sensor? The delete was on the cards so maybe I'll get it done sooner than planned

 

[LeonCR]

yep and it probably the best move you will ever make

 

[AndrewJB]

DPF Delete wouldnt solve the sensor problem, you will still have the sensor problem, BIGG Addicted had a few sensor problems after DPF Delete, but they wernt connected to the DPF Delete, just he had bad luck with the sensor lottery

My old PD170 on the other hand never had a sensor go wrong

 

[LeonCR]

DPF Delete wouldnt solve the sensor problem, you will still have the sensor problem, BIGG Addicted had a few sensor problems after DPF Delete, but they wernt connected to the DPF Delete, just he had bad luck with the sensor lottery

My old PD170 on the other hand never had a sensor go wrong

i would have thought DPF delete would map out the sensors

 

[AndrewJB]

Nope, Most tuners just turn up the values apparently to values that the cars sensors are never going to read.. thats wat ive heard anyway

If the sensors where mapped out BIGG wouldnt of had problems with his, Also if the sensors wernt needed you wouldnt need to plug them into the Milltek DPF Delete pipe you could simply just cut them off or something similar

 

[Benzy]

Do u no roughly how much the sensors would cost to change if I keep getting the problems after the delete

 

[AndrewJB]

Hmm think there about £100 each, Speak to BIGG Addicted as i said hes abit of a sensor master, i never had a problem

 

[Benzy]

Ok brilliant thanks. So just to be clear once iv had the Dpf done they will turn the values up for the sensors so I may not need a new one unless the problem keeps coming up after?

 

[DerbyForget]

Coil light usually means one of the sensors is on the way out


The car went into limp mode, it wouldnt go into limp mode if it was Regening


Probably The DPF Pressure Sensor

+1 i had the exact same problem, sometimes when i turned the ignition on it came up with the coil light and went into limp mode... it is definately a faulty sensor.

it turned out to be my (MAP) manifold absolute pressure sensor. had it replaced under warranty along with a wiring loom replaced (under recall?? apparently) for that very sensor... phone seat up and get it sorted

 

[Benzy]

Ok so how do I work out what sensor it is? Will a VCDS tell me? And how does a VCDS differ to a standard code reader as no fault codes came up with the standard one?

 

[DerbyForget]

well that's the tricky thing with faulty sensors, 9 times out of 10 they will work and won't flash up on the dash (until they are completely buggered this is!) you can only get a fault code when the coil light is flashing. so your only option is to drive it until it happens again then limp it to a garage or someone with a decent fault code reader, such as vcds...

 

[Benzy]

Thats what's confusing me tho, the light was flashing when I scanned it and nothing came up bloody thing. Well it's a good excuse for me to get the Dpf deleted anyway and the misses has agreed to it now boom haha

 

[DerbyForget]

lol getting a DPF delete isn't going to make the sensors anymore reliable aha and I hope you like cleaning soot off your back bumper

 

[AndrewJB]

He can get the Stage 0 DPF Delete


It will offer maybe 5bhp more, no smoke and no DPF