I took my H4 to my local garage for the annual MOT following a new cam belt, plugs, filters and oil. It shouldn't have failed..but it did.....on emissions. And this is where modern mechanics enters (for me) the realms of voodoo or witchcraft. It's a fuel injected 16v zetec with about 40k on the clock only...with new oil and filters and a satisfactory exhaust...but it fails on emissions? Two new sensors are fitted...something to the block..temperature? and a Lambda sensor? The situation improves but not enough...so a new catalytic converter is acquired...and fitted...but the situation has still not improved enough....so my garage man wants to call in a specialist auto electrician, as he believes that there is some kind of electrical fault...either wiring or (Please no) within the ECU. He (my garage man) freely offers that he is really out of his depth...so I've agreed to the specialist guy having a look...but he ( a travelling man who undertakes specialist work for various small garage businesses in my area) probably can't do the business until next Tuesday..and that's just for diagnosis! Friends...I need information: what is likely to be the problem here? Should I be preparing for further expenditure on replacement parts? Where should I start? with thanks in anticipation.... Bill
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