A4 1.8T Cat problems / Engine management
Sorry if this is in the wrong thread as I couldn't find anywhere to put this for a 2002 A4.
I purchased my car a couple of months ago and driving it home the engine management light came on. It came up with a cat / lambda sensor fault so both sensors and the cat was replaced.
The engine management light has come up again with the same fault and the garage is stumped as to why. It is also apparent that this is the 3rd cat in 7 years. The mechanic thinks that this fault may come up because the cat installed is an aftermarket cat. Has anyone heard of this throwing up an engine management fault and why the car is going through cats at a rate of 1 just over every two years?
Also, I'm used to driving diesels and this is petrol 1.8T. I'm fairly light footed and drive about 25 miles per day up A roads and dual carriageways yet I seem to be using £20 per 120 miles. Is this normal fuel consumption?
It passed its MOT today and I was expecting it to come up with emissions fault due to over fuelling. Thankfully it didn't but I'm stumped at the fuel usage rate.
Any help and advice would be gratefully received.
a4 t sport lambda sensor problem
I have had this problem with the lambda sensor and the engine management light re-appearing, I took the car back and got it checkd out, I was told that the light was coming back on due to combustion and mis-firing, but the car wasnt mis-firing? however got the light switched off but told that if re-appears then bring the car back.
Regarding the fuel situation, I feel 1.8t is quite juicy on the petrol.