VW POLO 1.4L 16v 2000
Failing MOT emissions test due to high CO and low lambda readings. Coolant temperature sensor and oxygen sensor before catalytic convertor replaced; fault not cured with the emissions test still showing high CO and low lambda readings.
The fault was caused by a faulty EVAP canister purge valve. After fitting a new EVAP purge
valve, the emissions readings were restored and emissions re-test passed. It is also recommended to use Clean & Protect (Advanced Formula Motor Flush and Oil System Protector) to clean and maintain the oil system and add Advanced Formula Gas Treatment to the fuel tank to clean and lubricate the fuel system.
Thanks to Stuart at Stuart Ikin Motor Services in Alcester, Warwickshire.
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