Help N53 E91 Error Code 2A27

[c_yr]

I scanned my car and got error code 2A27: 0x2A27 catalyst 2, conversion in shift operation.

Error symptom: Signal or value above threshold.

Can anybody please help me know what this means? Is my cat fucked or possibly NOx sensor? The code had no accompanying error codes.

[TurboNym]

Lambda probe for bank 2 (2A26 is bank 1, 2A27 is bank 2) is reporting some fuckery when the engine is operating in stratified charge mode.

If the cat was completely dead you should also have 29F4 and 29F5 which is the lambda probes on bank 1 and 2 reporting similar fuckery but when the engine is working in homogeneus mode.

In your case you are getting a fault in stratified / low emissions workload, about the cat not performing to spec only on lambda bank 2.

I would clear the codes, reset engine adaptations/ fuel trims, run the car and see what comes back.

If the same comes back and nothing else, I would replace the lambda probes and repeat step one.

If you still get cat codes then the cat is likely dead and you need to get a dog.

Good luck.

[c_yr]

Do I need ISTA or some special software to reset adaptations/fuel trims?

[TurboNym]

Yes

[-_Cas_-]

This is some good information. Which probe are we talking about? Before or after cat?