Multiple ECM Codes - 2A20, 2A2A, 2810 and 2A1A

keithhitch · Post by **keithhitch** » 10 Feb 2020, 04:57

Hello all,

I have a 2004 XC90 2.5T and I love it. I recently had some issues and now I need some serious help. I had to replace the Fuel pump and Crank Position Sensor. Got the parts from FCPEURO. I then had codes that told me that both O2 sensors were bad. I got the Bosch sensors from FCPEURO again and was able to finally install them (had to fight the sensors to remove after multiple days of using PBBlaster on them). Once I got the sensors installed I get the 4 ECM codes listed in subject. I have run the car multiple days to see if the codes will clear and they do not. I did try to clear the codes with scanner and they keep showing up. I did not disconnect the battery prior to replacing the sensors. Is this an issue?

Any idea what this might be? I read somewhere that this might be a MAF issue. Any help is appreciated.

Thank you,

Keith in PA.

Post by **RickHaleParker** » 10 Feb 2020, 08:35

Check fuse 11B/4 in the engine compartment (Power to the O2 sensors heaters).

keithhitch · Post by **keithhitch** » 12 Feb 2020, 08:38

I checked the fuse at number 11 and it is fine. I also cleaned the MAF with MAF cleaner. Any other ideas?

Post by **RickHaleParker** » 12 Feb 2020, 08:46

keithhitch wrote: 12 Feb 2020, 08:38 I checked the fuse at number 11 and it is fine. I also cleaned the MAF with MAF cleaner. Any other ideas?

Check again, 11B is the top side of the fuse box in the engine compartment. /4 is fuse number 4 of 11B.

keithhitch · Post by **keithhitch** » 12 Feb 2020, 09:26

I will be checking 4 when I get home.

keithhitch · Post by **keithhitch** » 14 Feb 2020, 06:24

I rechecked both the 11B and the 4 fuse and both are the correct amperage and I still get the codes. When I start the car rear amperage is 0.45 and front is 1v. These do not change for a while until I get moving down the highway. They vary some but stay real close to the initial amperage. Is there any chance this might be a result of dirty contacts? I really am running out of ideas. What are the odds of receiving 2 bad O2 sensors from FCPEuro?

speedrcrjl · Post by **speedrcrjl** » 10 Jul 2024, 18:28

Did you have a fix to this? I am having same codes with the same voltages