#1: 206 Gti Antipollution/over-fuelling Author: Brian, Location: VVT Land, FifePosted: Tue Feb 17, 2015 9:41 am ---- Hi all it's been a while,
I have recently acquired a 54 plate 206 GTi 138. It was originally showing an anti pollution fault when cold and stayed on all day. I have since replaced the llambda sensors, coil pack, spark plugs, air filter, coolant temperature sensor, timimg belt and water pump. MAP sensors was cleaned and reading fine. Air temp sensor is all reading fine. New download to ECU has been done too...All related to this fault.
There is a permanent fault code is showing as P0170: Mixture regulation. This points towards an over-fuelling issue. Another intermitent code shows as: P0131 Upstream Oxygen sensor open or short circuit and all wiring has been checked.
Any ideas?
Thanks in advance...tearing my hair out here.
Cheers,
Brian
#2: Re: 206 Gti Antipollution/over-fuelling Author: LeeThr, Location: North West WalesPosted: Tue Feb 17, 2015 10:28 am ---- Has the cat been removed?
#3: Re: 206 Gti Antipollution/over-fuelling Author: kandlbarrett, Location: SwindonPosted: Tue Feb 17, 2015 2:17 pm ---- +1 for CAT removal or defective CAT.
What did plug colours suggest? Though on modern cars the emissions are so tight it can throw a light without plug colours being much help but it is worth looking. They may help identify if it is a single cylinder problem or across all plugs.
Might also be worth buying a cheap infra red temp sensor. A cooler manifold on any one cylinder will again help identify if it is a single cylinder problem or across all.
It might also be worth getting a garage to do an exhaust gas reading. That will help.
And finally, my favourite, is exhaust leak before lambda even a very small one. Some air gets in as well as exhaust getting out. Lambda sees the oxygen in the air, signal says car is running lean and ECU richens the mixture. This gets beyond capability of CAT to correct and post CAT lambda throws a code. The excess fuel also eventually destroys the CAT.
Leaking injector?
#4: Re: 206 Gti Antipollution/over-fuelling Author: kandlbarrett, Location: SwindonPosted: Tue Feb 17, 2015 2:20 pm ---- Lambda open circuit. That us a lot of wiring between lambda and ECU to be 100% certain it isn't The wiring. Are you 100%?
#5: Re: 206 Gti Antipollution/over-fuelling Author: Brian, Location: VVT Land, FifePosted: Wed Feb 18, 2015 10:08 am ---- Thanks a lot for your help guys, i will check the cat and wiring!
#6: Re: 206 Gti Antipollution/over-fuelling Author: kandlbarrett, Location: SwindonPosted: Wed Feb 18, 2015 11:03 am ---- Check exhaust for leaks. One person with a rag over the end and a second crawling under the car and under the bonnet.
#7: Re: 206 Gti Antipollution/over-fuelling Author: Addaz, Location: SuffolkPosted: Wed Feb 18, 2015 2:53 pm ---- Upstream wouldnt be affected by a decat, the mixture may well be bought on by the lambda fault.
Check wiring, if okay, check the engine timing and compression
#8: Re: 206 Gti Antipollution/over-fuelling Author: Project2062014, Location: CornwallPosted: Wed Feb 18, 2015 9:20 pm ---- States fuel trim if mix is wrong on Diagnostics.
Cat has probably gone .
Reset the eml light & see if it comes back on after a 20mile trip before you do anymore.
If so then cat .
#9: Re: 206 Gti Antipollution/over-fuelling Author: Addaz, Location: SuffolkPosted: Thu Feb 19, 2015 3:00 am ----
Project2062014 wrote:
States fuel trim if mix is wrong on Diagnostics.
Cat has probably gone .
Reset the eml light & see if it comes back on after a 20mile trip before you do anymore.
If so then cat .
Upstream is before the cat and does not monitor the cats efficeny at all. So how does this indicate to you its a failing cat?
#10: Re: 206 Gti Antipollution/over-fuelling Author: Project2062014, Location: CornwallPosted: Thu Feb 19, 2015 5:01 am ----
Addaz wrote:
Project2062014 wrote:
States fuel trim if mix is wrong on Diagnostics.
Cat has probably gone .
Reset the eml light & see if it comes back on after a 20mile trip before you do anymore.
If so then cat .
Upstream is before the cat and does not monitor the cats efficeny at all. So how does this indicate to you its a failing cat?
Missed the upstream . PRE CAT lambra . Must be a connection thats dogey ?. Seems strange . Try checking fuel injectors i bet there is a dogey one . a injector fault ? Not fueling correctly ..
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