box100 Posted September 3, 2016 Report Share Posted September 3, 2016 I've read this may be a faulty back oxygen sensor but have been unable to change. I believe they are indication only, my car has recently passed its MOT with a healthy emission test so think it's a false alarm. Does anyone know if it's a legal requirement to have these? If not can they be disabled / linked out? Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 3, 2016 Report Share Posted September 3, 2016 In for answers aswell please. Same issue but with P0431 aswell. Link to comment Share on other sites More sharing options...
RickLS7 Posted September 6, 2016 Report Share Posted September 6, 2016 If the faulty sensor is after the cats then no problem, the ones in front actively control the fuel trim so you will have to replace those. Why are you unable to change? It just requires access underneath and a 22mm spanner. Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 7, 2016 Report Share Posted September 7, 2016 10 hours ago, RickLS7 said: If the faulty sensor is after the cats then no problem, the ones in front actively control the fuel trim so you will have to replace those. Why are you unable to change? It just requires access underneath and a 22mm spanner. Both my faults are downstream so after the cats, previous emissions test from 2 months back passed with flying colours. Having a mechanic fit some lambda spacers tomorrow so hopefully will stop the CEL. Link to comment Share on other sites More sharing options...
RickLS7 Posted September 7, 2016 Report Share Posted September 7, 2016 Don't think removing them will get rid of the CEL without a re-flash. My point was it is safe to remove the rear sensors as they do not affect anything - sniff only! Link to comment Share on other sites More sharing options...
Patt Posted September 7, 2016 Report Share Posted September 7, 2016 Mark has removed his without a re-flash. It's on my to-do list, as one of mine pops the error quite often, despite being replaced recently Link to comment Share on other sites More sharing options...
RickLS7 Posted September 7, 2016 Report Share Posted September 7, 2016 You might have to ground the sensor wire or apply a voltage to get the CEL off (not sure which sorry). Simply removing the sensor will not get rid of the error. Sure someone will know, there are loads of cat delete exhaust systems and they cant all be driving around with the CEL illuminated. Personally, I would just replace all the sensors, think they are £30 each on the 986. Link to comment Share on other sites More sharing options...
edc Posted September 7, 2016 Report Share Posted September 7, 2016 As above @Mark Shead simply removed his rear sensors on his 986 and it seemed to work. For me, I am running with the rear sensors in and (I think working) but the CEL on permanently due to the sports cats. I check and clear the codes every few months. Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 7, 2016 Report Share Posted September 7, 2016 10 minutes ago, RickLS7 said: You might have to ground the sensor wire or apply a voltage to get the CEL off (not sure which sorry). Simply removing the sensor will not get rid of the error. Sure someone will know, there are loads of cat delete exhaust systems and they cant all be driving around with the CEL illuminated. Personally, I would just replace all the sensors, think they are £30 each on the 986. Looking at the 987, im getting around £60 each. Don't think the spacers will work then? Got the mechanic coming tomorrow to my work to fit them lol. Might just ask him to remove both downstream sensors then? Does anything need to be done after they are removed? Wouldn't it fail an MOT without them? Link to comment Share on other sites More sharing options...
edc Posted September 7, 2016 Report Share Posted September 7, 2016 The spacers worked for a short time for me but the light soon came back. Link to comment Share on other sites More sharing options...
Patt Posted September 7, 2016 Report Share Posted September 7, 2016 £120 ea for the Bosch ones, I've had to replace five so far. Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 7, 2016 Report Share Posted September 7, 2016 3 hours ago, edc said: The spacers worked for a short time for me but the light soon came back. Will give it a go, only cost me £15 to be honest. 2 hours ago, Patt said: £120 ea for the Bosch ones, I've had to replace five so far. Should I replace the two downstream first and go from there or replace all 4? Link to comment Share on other sites More sharing options...
Patt Posted September 7, 2016 Report Share Posted September 7, 2016 I've only replaced as the error codes dictate. I've had enough of the 2nd O/S one throwing "out of spec" errors now. Hence my plan to remove (and earth if required) Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 7, 2016 Report Share Posted September 7, 2016 4 minutes ago, Patt said: I've only replaced as the error codes dictate. I've had enough of the 2nd O/S one throwing "out of spec" errors now. Hence my plan to remove (and earth if required) Ok thanks alot, I get bank 1 downstream and bank 2 downstream... so assume thats both the back ones. Link to comment Share on other sites More sharing options...
edc Posted September 7, 2016 Report Share Posted September 7, 2016 Have a look at this http://www.pistonheads.com/gassing/topic.asp?h=0&f=&t=1306390 Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 7, 2016 Report Share Posted September 7, 2016 10 minutes ago, edc said: Have a look at this http://www.pistonheads.com/gassing/topic.asp?h=0&f=&t=1306390 Think I've read that before, all it makes me think is that there are various reasons the CEL shows up lol. Link to comment Share on other sites More sharing options...
edc Posted September 7, 2016 Report Share Posted September 7, 2016 It shows a specific reason for that fault code and EML coming on and then the attempted fix of replacing 02 sensor will not work as the code will likely re-appear. What it doesn't go on to finish is what the real solution is. Link to comment Share on other sites More sharing options...
Patt Posted September 7, 2016 Report Share Posted September 7, 2016 mine often re-appears just after re-fuelling too. I'll check my fuel cap, before I reset the light tonight. Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 14, 2016 Report Share Posted September 14, 2016 On 07/09/2016 at 4:47 PM, edc said: It shows a specific reason for that fault code and EML coming on and then the attempted fix of replacing 02 sensor will not work as the code will likely re-appear. What it doesn't go on to finish is what the real solution is. Getting the 02 sensors coded out by a remapping specialist in the next week or so which will hopefully remove the problem (same thing they do with cars with modified exhuausts).. he is also remapping it for an extra 10HP and 20 torque for free. Link to comment Share on other sites More sharing options...
RickLS7 Posted September 14, 2016 Report Share Posted September 14, 2016 Thought you'd need a re-flash to get rid of the CEL. How much is he charging you? Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 14, 2016 Report Share Posted September 14, 2016 1 minute ago, RickLS7 said: Thought you'd need a re-flash to get rid of the CEL. How much is he charging you? Normally he was charging £275 but we are doing it for £300 and he is visiting my office to do it while I work. Link to comment Share on other sites More sharing options...
RickLS7 Posted September 14, 2016 Report Share Posted September 14, 2016 Think I would pay more and have it mapped properly on a rolling road personally. A good tuner can pick up all manner of other issues but not without running it hard. Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 14, 2016 Report Share Posted September 14, 2016 5 minutes ago, RickLS7 said: Think I would pay more and have it mapped properly on a rolling road personally. A good tuner can pick up all manner of other issues but not without running it hard. He does have a rolling road at the place he usually does it (his business is a remapping centre) the problem is I am getting married soon so have literally no free time. Not sure if he is possibly bringing a rolling road to me. May bite the bullet and take a day off work and get it done. Link to comment Share on other sites More sharing options...
RickLS7 Posted September 14, 2016 Report Share Posted September 14, 2016 If you can, take it over to him. Portable rolling roads are much flimsier plus of course there are weather and noise considerations outside your office so he won't be running it as hard. The cheapest solution for warning lights is a bit of black tape: Link to comment Share on other sites More sharing options...
TrickeyTattoo Posted September 16, 2016 Report Share Posted September 16, 2016 On 14/09/2016 at 3:45 PM, RickLS7 said: If you can, take it over to him. Portable rolling roads are much flimsier plus of course there are weather and noise considerations outside your office so he won't be running it as hard. The cheapest solution for warning lights is a bit of black tape: But then if anything serious did happen I wouldn't know This is the email I got from the guy doing the work - 'Hi Alex All development work is done on a rolling road and we spend a long time, sometimes days, working on rolling road and road tests to get the map right for each engine. Once that is completed it becomes the template map. When we read the map from each car we remap we use the ID information in the file to integrate the correct template for the new tuning. This is the way the remapping industry works for anything other than heavily modified engines. Any company offering a 'rolling road remap' for under £800 or so is only using the rolling road to show before and after figures as it is impossible to write a good one-off map in an hour or two. In reality the pre-payment road test is much more important than a rolling road read-out. I might also add that a rolling road test creates very high levels of stress on engines. This is why disclaimers absolve companies of all responsibility for cars on rolling roads. Personally I would not want my car to go through rolling road stresses.' Link to comment Share on other sites More sharing options...
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