MOT stations have to update their gas measuring equipment regularily to meet ever stricter requirements so there are usually many for sale on Ebay.īe warned though and try before you buy as if they are faulty the repairs are both specialist ad expensive. I have found it OK for older cars such as my 1600M without cats that have fairly high emissions but for the S3 and Griffith a waste of time. The Gunson does not measure CO content directly and is useless for modern cars as the CO limit is far below the Gunsons accuracy. If your S4 is fitted with a Catalytic convertor and has to meet low emission limits the Gunson will not be much use. Pete Wednesday 20th May 2009 I want to check the mixture of my engine and have seen the Gunson Gastester on the bay for around 75.Ĭheers, Steve.
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