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Showing results for tags 'catalytic converter engine management light eml o2 sensors'.
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Hello - I'm new to Audi's and need some help. I recently bought a lovely 2010 Audi S3 Sportback. Gorgeous car. I've not long had it and the engine management light has come on; took it into my local garage and they said it's showing this error code - P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1). [harsh to pay £60 just to get that info] From what I can deduce; it's either an issue with the Cat or Sensors or both. Although first off; I will use a Cat Cleaner petrol treatment. So I have a few questions: Any tips on a good cat cleaner petrol additive to use in an Audi? Halfords sell Cataclean; ECP sell TopCat? Any other tips on resolving the issue without replacing either Cat or Sensors? If I do have to replace either of these; any idea on likely average cost? Any tips on a good value code reader to buy? (i won't be shelling out £60 the next time a light comes on) Thanks in advance. I do very much appreciate any tips
