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Thanks everyone. She's booked in with LR this afternoon.

I only have one set of figures but they said it was the same on the LPG; high CO. As far as I know the Lambda sensors are working. They have been replaced; the others had only been in a year and 6 months of that it was standing waiting for the engine change.

Yes. :) That's what I thought. It's replaced the 4.0l V8 I cooked the heads on back in January. It's LPG converted but the results are the same on both petrol and LPG. I figure if we can get the petrol right the LPG will be fine. Suggested that to them last week and they've said there aren't...

I have a disco 2 4.0l V8; reconditioned engine put in a month ago and failed the MOT due to emissions. Computer showed codes for the MAF and both pre cat Lambda sensors; all have now been changed but emissions still too high. Fast Idle Test CO 3.82% Fail HC 137ppm Pass odd squiggly thing 0.918...