Hi all,

My S70 T5 SE is, more than likely, running rich. I say this because the engine management light is constantly coming on, with the rear 02 sensor being the culprit. Once before it was the MAF sensor, but that was sorted and hasnt reoccurred. Im not sure if the front 02 sensor has ever triggered, but its the 02 all the same.

Now this could either be a faulty sensor, yes? Or, there is some kind of problem where its taking in too rich a mixture and causing the fault code.

What can be done to try and aleviate this? Changing the sensor seems false economy if the cause is still goingn to be an issue.

Or, as is often the case, something completely different will be pointed out and I'll go "oh yeah!!' or something like that.

Im getting about 26 to 28 mpg which is probably about right however it cost me £62 to get to Norfolk and back and that was keeping it around 70 and driving more smoothly etc. I cant keep spending that! Believe me I would be devastated if the car had to go but..