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Discussion Starter · #1 ·
Hi all,

My 2.5T throwed a MIL. Using VIDA I retrieved these codes ECM-120D and ECM-221B



The XC90 has around 84k miles on it. The rear oxygen sensors and the air mass flow unit is original. Is this as simple as it seems? These two parts are really faulty? Anything else I should check before replacing these? The oxygen sensors and air mass flow to go out at this mileage feels kind of too early.

I tried erasing the codes but it came back.

Thanks!
 

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How many times have you changed your air filter? You can clean your maf and clear the code and see if it comes back.
 

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Discussion Starter · #3 ·
Air filter changed twice. I'll try cleaning it. It was cleaned around 6k miles ago.

Thanks
 

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Discussion Starter · #4 ·
Thought I'd give an update.

Replaced the rear oxygen sensor. Cleared the codes and both the rear oxygen sensor and MAF codes didn't come back.
 

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Had exactly the same issue at around 110k. Used a Bosch sensor, little cheaper, did the trick.
 
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