I have seen a newish diesel volkswagen transporter fitted with a cat converter. There was no oxygen sensor fitted on the exhaust. As I underststand things, one way to establish if or not an older petrol engined car is fitted with a 'cat' is to check for the sensor being fitted. (ie. no sensor, no cat). Are diesel engine's different?
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DIESELS ARE FITTED WITH TWO-WAY OXGENATING CATS RATHER THAN THE THREE-WAY CATS OF A PETROL ENGINED CAR. A LAMBDA SENSOR IS NOT REQUIRED TO MONITOR THE MIXTURE OF THE EXHAUST GASES.
HJ
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