failed MOT on emissions

1999 VAUXHALL ASTRA
185,000 MILES • 4 CYL • 2WD • MANUAL
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RACHEL URBACH
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  • 2 POSTS
I have a v reg Vauxhall astra, 1.6l petrol. It has failed MOT on CO emissions and mechanic can't solve problem. He's cleaned the engine. Any suggestions as to why it's failing? thanks, Rachel
Dec 15, 2010 at 4:09 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
High CO could be caused by the oxygen sensor or the coolant temperature sensor stuck in the open loop mode-not switching
Dec 15, 2010 at 4:31 PM
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RACHEL URBACH
  • MEMBER
  • 2 POSTS
thanks for that. And are those simple things for my mechanic to sort out?
Dec 15, 2010 at 4:47 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Yes, if he knows his stuffs
Dec 15, 2010 at 5:04 PM
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