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ECN 04205A Astra H 2008

[Astra Mk5/H] [04-09]
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18K views 2 replies 3 participants last post by  Frasier  
#2 ·
P0420 relates to catalyst efficiency - the rear oxygen sensor is reading too closely to the front - which in effect means that the catalyst isn't doing its job. Sometimes poor fuel quality I've known bring on this fault, but ultimately it'll mean a replacement catalyst will be required.
 
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