All Things Mk5 > Mk5 General Area
Help with intake leak code
ZoliWorks:
Well if you have a sports cat, the post cat lambda reading is way out of factory spec because a sports cat flows better than the 2 stock cats. It filters out less so the lambda read different values. You either need to get the 2nd sensor mapped out / adjusted via the map or you use a spacer to space out the sensor from the downpipe, making it read closer to factory specs. It will start popping up more and more frequently cause sports cats are cheap and way lower quality than factory cats so they burn out sooner and their efficiency decreases. Some guys here replace them once every 2-3 years cause they no longer pass inspection. I've only had mine for half a year and the tone of the engine changed drastically since I first fitted it. I'll likely have to replace it next year if I want to pass checks.
ZoliWorks:
Also, about P2279
https://www.obd-codes.com/p2279
Jons1001:
--- Quote from: ZoliWorks on November 20, 2024, 03:48:33 pm ---Well if you have a sports cat, the post cat lambda reading is way out of factory spec because a sports cat flows better than the 2 stock cats. It filters out less so the lambda read different values. You either need to get the 2nd sensor mapped out / adjusted via the map or you use a spacer to space out the sensor from the downpipe, making it read closer to factory specs. It will start popping up more and more frequently cause sports cats are cheap and way lower quality than factory cats so they burn out sooner and their efficiency decreases. Some guys here replace them once every 2-3 years cause they no longer pass inspection. I've only had mine for half a year and the tone of the engine changed drastically since I first fitted it. I'll likely have to replace it next year if I want to pass checks.
--- End quote ---
Thanks, the sports cat already won't pass an mot as of last year...
It's good that you mentioned the two different readings as the mechanic was saying he read mine and they were different which points to a bad sensor, however i now know that it is just the map. I asked them (remap company) about this when i got the map tweaked - guess they just sold me a Lambda sensor when i may not have needed one. Surely an established mapping company like they are would know to map out the lambda sensor though :doh:
Still a bit stumped then, probably going to fit a new PCV and go from there.
ZoliWorks:
I'm not sure exactly if the 2nd sensor is just a check sensor or if it actually influences the fuel trims in anyway. On the forums I've heard it's only there to test the cat efficiency and doesnt actually influence fuel trims but one of my mechanic buddies claims it does influence trims.
If it does influence trims, then it needs to be mapped out or spaced out to get rid of the error/CEL. I'm not actually sure if mine is mapped out or I just got lucky and it hasn't thrown a cel but I'm leaning towards the fact that it's mapped out since I did specify to my mapper that I have a sports cat.
Jons1001:
--- Quote from: ZoliWorks on November 20, 2024, 04:57:02 pm ---I'm not sure exactly if the 2nd sensor is just a check sensor or if it actually influences the fuel trims in anyway. On the forums I've heard it's only there to test the cat efficiency and doesnt actually influence fuel trims but one of my mechanic buddies claims it does influence trims.
If it does influence trims, then it needs to be mapped out or spaced out to get rid of the error/CEL. I'm not actually sure if mine is mapped out or I just got lucky and it hasn't thrown a cel but I'm leaning towards the fact that it's mapped out since I did specify to my mapper that I have a sports cat.
--- End quote ---
Where’s Pudding aka the oracle :notworthy: when you need him? :smiley:
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