PETROL

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jonny996

Original Poster:

2,625 posts

219 months

Wednesday 25th February 2009
quotequote all
Been having an ongoing issue with car,

bit of back ground, it is a 2002 325 sport saloon 28000 miles. just had full inspection 2 & MOT so no issue with immisions,
For the last 6 months every now and then a yellow warning light comes on, out line of an engine, book states emmeisions outwith range. see above they are fine. I have been keeping track of this and I have found out something quite bizzar!!!!.

If i start with no light on, fill up with 95ron petrol out of morrisons light will come on within 50 miles & stays on, run tank down fill up with shell 95ron & light goes out after 200 miles or so. stay on shell & no light at all, fill up at morrisons and , yip it is back on again.

I know easy answer fill up with shell all the time, I pass a shell station every day & it is the same price so no worries, BUT has anyone any idea why this would be happening?

E30M3SE

8,470 posts

198 months

Wednesday 25th February 2009
quotequote all
Cheap fuel contaminating one of your O2 sensors, if your replaced the sensor for a new one it may be ok, but cheaper and easier just to use 'decent' fuel.