fusionfan Posted June 23, 2017 Share Posted June 23, 2017 Any thoughts? Quote Link to comment Share on other sites More sharing options...
iantt Posted June 23, 2017 Share Posted June 23, 2017 upstream or downstream? Quote Link to comment Share on other sites More sharing options...
Jethro_Tull Posted June 23, 2017 Share Posted June 23, 2017 Is it bringing up the EML, and does the car have any other symptoms? Quote Link to comment Share on other sites More sharing options...
JamesMalin Posted June 25, 2017 Share Posted June 25, 2017 I presume you'd start getting a fault code intermittently if it was failing. I recently just had one replaced on my car and it failed completely and brought up a fault code. That image looks like a perfect wave form to me :D 1 Quote Link to comment Share on other sites More sharing options...
iantt Posted June 25, 2017 Share Posted June 25, 2017 if thats upstream then its fine, downstream then cat is knackered. Quote Link to comment Share on other sites More sharing options...
Tdci-Peter Posted June 25, 2017 Share Posted June 25, 2017 On 23/06/2017 at 7:02 PM, fusionfan said: Any thoughts? Like Ian & James say, if it is upstream, then I think it looks ok. The fuel/air mix in a petrol car is continuously varied between a little rich, and a little lean. This enables the cat to reduce the NOx (that means removing oxygen) when rich, and to oxidise CO & unburnt fuel (by adding oxygen), when lean. The design of the cat combined with this swing means it can do both jobs at the same time. The downstream sensor should have a more stable signal, showing the cat has done its job. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.