emmisions results
Hi everyone, could you please help me:
my 94 wrx has failed its mot on emissions. results below. its failed on the c0. could it be - bad lamda? - bad cat? - exhaust leak? - cat not hot enough? (every garage I ask to test at 3.5% says they have to use .3% as has this one - they would not even take it out for a longer run to get the cat super hot! im going to take it else where but could do with some advise on the readings please. fast idle test co 0.95% fail hc 66ppm pass lambda 0.99 pass second fast idle test co 1.08% fail hc 55ppm pass lambda 0.97 pass natural idle co 2.33 fail |
CO is more than likely a cat issue. Was the cat hot when the car was tested?
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hi, the car has been stood for 18 months, I drove it across town as hard as I could to get some heat into it. it was then left for 25 mins before they tested it. I had to leave it with them so I have no idea if they gave it a run first but when questioned they said the car was up to temperature as per any other car they test.
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suspect I may have to book another test a bit further away from home maybe? its difficult cos its not taxed or mot at the mo which makes getting it warm before a test difficult.
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Find a decent tester and tell him what's up.
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bit of an update:
I tested the output voltage of the lambda sensor with the engine warm and idling and it was stuck at around 0.4 volts. so ive fitted a new lambda but its the same. it will flick up and down between 0.1 and 0.9volts if I rev the engine but it wont cycle at idle. I suspect the car is not dropping into closed loop? why would this be? coolant sensor maybe? |
you just need a "friendly" M.O.T tester ...that all :D
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Hi,
I had the same problem at my mot for a 95 WRX RA. I found this pic on a similar post, printed it out and took it back. They passed it straight away. Depending on the year of manufacture the import won't need a cat test if they can't find the exact model on the database. Might help you a little. |
the universal lambda for £17 and some drop links for £13 off ebay have done the trick - shes passed! also took that BET info down too and they were alright with it.
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Well done, you can relax for 11.5 months now!
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