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Always learning something
Join Date: Sep 2016
Location: Ottawa, Canada
Posts: 319
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Need Help! 987 Cayman CEL and throttle hesitation
Ok, need some input. Car has had the odd throttle hesitation and threw a P0421 code a month ago, which I posted here. Says warm up catalyst efficiency below threshold (bank1). We changed the cats to a much newer oem set (my car has 97,000 kms), new set is about a quarter of that mileage. Drove about 250kms and throttle hesitation is back as well as a new code (pictured below).
Throttle body has been cleaned, cats look new, new header gaskets. What else can it be? I’m thinking MAF or need new O2 sensors. Anyone else seen this? Car is 2006 Cayman S.  Sent from my iPad using Tapatalk
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1987 930 Guards Red 2004 Acura NSX Supercharged 2006 Mini Cooper S 2019 Cayenne eHybrid |
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09-23-2019, 05:02 AM
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Join Date: Aug 2019
Posts: 14
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Ok check the tightness of header bolts.
If there’s a leak there the first lambda will see lean mixture coating the cat with fuel the second lambda will see over rich triggering the Code |
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09-23-2019, 12:43 PM
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Always learning something
Join Date: Sep 2016
Location: Ottawa, Canada
Posts: 319
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Header bolts are fine. Still throwing code.
Sent from my iPhone using Tapatalk
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1987 930 Guards Red 2004 Acura NSX Supercharged 2006 Mini Cooper S 2019 Cayenne eHybrid |
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10-06-2019, 08:35 AM
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Replace bank 1 sensor 2 and that should fix it. If it comes back then your “new” cat is bad.
B1S2 is after cat Tony |
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10-09-2019, 04:35 AM
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Always learning something
Join Date: Sep 2016
Location: Ottawa, Canada
Posts: 319
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Quote:
But the reader is saying bank 2. Am I reading your message right? Sent from my iPhone using Tapatalk
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1987 930 Guards Red 2004 Acura NSX Supercharged 2006 Mini Cooper S 2019 Cayenne eHybrid |
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10-09-2019, 05:39 AM
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Join Date: Aug 2010
Location: Earth.............
Posts: 2,877
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Before I changed out ANYTHING, I would read the fuel trims to see where the engine is; it may not be the sensor at all...……...
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Accrochez-vous bien de vos rêves..........." |
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10-09-2019, 12:58 PM
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