Ford Puma. Do I need a new Catalyst?
Discussion
Long time lurker but help needed!
I've got a 'P0420 - Catalyst System Low Efficiency code' on my 2001 Puma. I decided to monitor some live readings from the oxygen sensors O2S11 (upstream) and O2S12 (downstream) which gave these results:
I'm definitely no expert, but from what I've read the fact the green line follows the red profile suggests that the Catalyst isn't it doing its job in converting the exhaust gas.... Thing is, it passed its MOT emissions just fine. I've also already replaced the downstream Lambda Sensor.
Should I just admit it that my Catalyst is goosed or does anyone have any other ideas or suggestions for other things I can check?
Cheers
I've got a 'P0420 - Catalyst System Low Efficiency code' on my 2001 Puma. I decided to monitor some live readings from the oxygen sensors O2S11 (upstream) and O2S12 (downstream) which gave these results:
I'm definitely no expert, but from what I've read the fact the green line follows the red profile suggests that the Catalyst isn't it doing its job in converting the exhaust gas.... Thing is, it passed its MOT emissions just fine. I've also already replaced the downstream Lambda Sensor.
Should I just admit it that my Catalyst is goosed or does anyone have any other ideas or suggestions for other things I can check?
Cheers
Can't see anything wrong to be honest, looks like the post cat sensor is following the front until the cat has warmed up and then flattens out, perfectly normal.
Like other have said if it passed the emissions test then it must be working OK. I've a lazy Cat on one of mine and takes a good warm up to get it working but it does eventually pass the emissions test.
If you want to learn more about checking Cats try this:
https://youtu.be/vyVnhCIMDnw?list=PLD2809EEC7BAAF9...
Like other have said if it passed the emissions test then it must be working OK. I've a lazy Cat on one of mine and takes a good warm up to get it working but it does eventually pass the emissions test.
If you want to learn more about checking Cats try this:
https://youtu.be/vyVnhCIMDnw?list=PLD2809EEC7BAAF9...
trickywoo said:
If it passes the mot what's the problem?
The EML is constantly on, tried resetting it but it only came back again.Mignon said:
What were the MOT test results for the exhaust emissions and lambda?
Fast Idle Test:CO = 0.17% (Limit =<20%)
HC = 4ppm (Limit=<200ppm)
Lambda = 1.006 (Limit 0.97-1.03)
Natural Idle Test:
CO = 0.08% (Limit =<0.30%)
Mroad said:
Can't see anything wrong to be honest, looks like the post cat sensor is following the front until the cat has warmed up and then flattens out, perfectly normal.
Like other have said if it passed the emissions test then it must be working OK. I've a lazy Cat on one of mine and takes a good warm up to get it working but it does eventually pass the emissions test.
If you want to learn more about checking Cats try this:
https://youtu.be/vyVnhCIMDnw?list=PLD2809EEC7BAAF9...
Sorry I should have been more clear. These readings are when the Cat is fully warmed up with a bit of throttle. Where it flattens out is where it was idling for a bit, not sure if that gives any clues!Like other have said if it passed the emissions test then it must be working OK. I've a lazy Cat on one of mine and takes a good warm up to get it working but it does eventually pass the emissions test.
If you want to learn more about checking Cats try this:
https://youtu.be/vyVnhCIMDnw?list=PLD2809EEC7BAAF9...
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