From time to time the check engine light comes on in my S70, but everything runs OK. Took it to the Volvo dealer who put their diagnostic code reader on and told me that it was 'something to do with fuel' but didn't know what. Suspected low quality fuel. Wanted to investigate but it comes and goes and they charge like 'a wounded bull' as we say, so I bought my own cheap reader on E Bay and the light came on today. Plugged it in and it came up with four straight lines indicating no fault, but then showed
I U S or it might be I U 5. I followed instructions and reset the light Ok but can't find any reference to those letters. Any ideas what it means please?
thanks, Kev
