Engine light, much weirdness

Gilby · 20th February 2013, 17:48

Had a few days with an intermittent engine warning light despite the car running absolutely fine.
Took her in and the diagnostics came up as the following.
P1E00 CAN-Bus
P0100 air mass sensor
P3595 glow system
P1255 Delivery fuel pressure sensor

Well, the guys at the garage reckoned that there's a domino effect going on, one fault triggering others. If I had all those at the same time I'd notice a problem actually driving it.
They cleared the faults and asked me to come back if it started again, hopefully it'd show less faults. (No charge for original diagnostic).
Managed two journeys fault free but it's back doing its on off thing.
I did notice that when it started it was whenever I came to rest at a junction or turning so basically at tickover, again, the car drove fine. The journey then became the same random light.
So any of you more knowledgeable types able to throw some suggestions as to which fault it's likely to be.
It's a diesel, unmodified with a good service history. Last one 7000 miles ago. I try to avoid supermarket fuel (although it does get some occasionally and I do treat it with millers Eco additive. Oh, it's on 109k.
It drives fine so I'm leaning to it being a sensor fault as opposed to an actual engine problem.
Cheers in advance good people.

Gilby · 21st February 2013, 18:14

Well it went for another diagnostic and we went down to three faults (not maf this time).
Costly trial and error work coming up I think.

Mike Noc · 21st February 2013, 18:59

Hopefully not. Check the plug connection on the LP pressure sensor - it sits in the top of the fuel filter. If that goes open circuit the MIL will come on and the car will still drive fine.

Gilby · 27th February 2013, 18:01

Thanks Mike. Looks like that's done the trick.
I disconnected the fuel pump wiring, sprayed some contact cleaner and reconnected it. No warning light for four days and have just had my best return on non motorway mpg for months (which may just be coincidental, who knows?)

craig8661 · 27th February 2013, 18:04

intermitant look at diesel filter and you will see a cable plugged in on one side unplug and spray some wd40 or contact cleener in and plug back in and see if that sorts it. that can cause engine light being intermitant and may just be the problem on yours

20th February 2013, 17:48	#1
Gilby Avid contributor Rover 75 Cdti classic Join Date: Jun 2012 Location: Shropshire Posts: 159 Thanks: 1 Thanked 0 Times in 0 Posts	Engine light, much weirdness Had a few days with an intermittent engine warning light despite the car running absolutely fine. Took her in and the diagnostics came up as the following. P1E00 CAN-Bus P0100 air mass sensor P3595 glow system P1255 Delivery fuel pressure sensor Well, the guys at the garage reckoned that there's a domino effect going on, one fault triggering others. If I had all those at the same time I'd notice a problem actually driving it. They cleared the faults and asked me to come back if it started again, hopefully it'd show less faults. (No charge for original diagnostic). Managed two journeys fault free but it's back doing its on off thing. I did notice that when it started it was whenever I came to rest at a junction or turning so basically at tickover, again, the car drove fine. The journey then became the same random light. So any of you more knowledgeable types able to throw some suggestions as to which fault it's likely to be. It's a diesel, unmodified with a good service history. Last one 7000 miles ago. I try to avoid supermarket fuel (although it does get some occasionally and I do treat it with millers Eco additive. Oh, it's on 109k. It drives fine so I'm leaning to it being a sensor fault as opposed to an actual engine problem. Cheers in advance good people.

27th February 2013, 18:04	#5
craig8661 Posted a thing or two rover 75 tourer cdt Join Date: Feb 2011 Location: Chesterfield Posts: 1,924 Thanks: 3 Thanked 4 Times in 4 Posts	intermitant look at diesel filter and you will see a cable plugged in on one side unplug and spray some wd40 or contact cleener in and plug back in and see if that sorts it. that can cause engine light being intermitant and may just be the problem on yours __________________ http://i984.photobucket.com/albums/a...y%20se/sig.jpg spoilt as i own a cdt auto connoisseur se cdt auto member 829 mods so far synergy 2 heated washer jets cant really add anything else as it has it all lol

21st February 2013, 18:14	#2
Gilby Avid contributor Rover 75 Cdti classic Join Date: Jun 2012 Location: Shropshire Posts: 159 Thanks: 1 Thanked 0 Times in 0 Posts	Well it went for another diagnostic and we went down to three faults (not maf this time). Costly trial and error work coming up I think.

21st February 2013, 18:59	#3
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,550 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Hopefully not. Check the plug connection on the LP pressure sensor - it sits in the top of the fuel filter. If that goes open circuit the MIL will come on and the car will still drive fine.

27th February 2013, 18:01	#4
Gilby Avid contributor Rover 75 Cdti classic Join Date: Jun 2012 Location: Shropshire Posts: 159 Thanks: 1 Thanked 0 Times in 0 Posts	Thanks Mike. Looks like that's done the trick. I disconnected the fuel pump wiring, sprayed some contact cleaner and reconnected it. No warning light for four days and have just had my best return on non motorway mpg for months (which may just be coincidental, who knows?)