Hi VJSantos, not sure why your ITV tester is so interested in the chassis number, mostly people will simply use the VIN which you already seem to have found. I think it is, as you said, the fault of the tester. The last place you mention, in the trunk is not where it is supposed to be, I think it is under where the hood stows, near the screwed down engine access panel under the carpet and sound-deadening material.

The emissions could be due to all sorts of things, faulty sensor, exhaust issue or a number of other things. Knowing your exact model and engine would help us here to help you.

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