P0134 help


Passed Driver's Ed
Hey All,

On a CBFA engine, which of the 3 sensors would throw a P0134 code(bank 1 sensor 1)? The one just before the cat?. Some back story I put on a KO4 thus eliminated the 02 bung on the turbo now in the top of the downpipe an have the 2 downstream 1 before an one after the high flow cat.. Had got the P0420 code right away after I finished the install an got my tune loaded etc. Eliminated it with a spacer on the post cat sensor. Been driving 5k miles since no problem. The other day I got the P0134.. an cleared it, it came back. What are the odds the sensor is actually bad? Or just due to my aftermarket catted DP?..Or something else..


Ready to race!
Bank 1 sensor 1 is the far upstream, so the one before the cat. Chances are the sensor has actually failed, it's a fairly common issue.


Passed Driver's Ed
I just want to make sure I'm not confusing the 1 directly after the turbo upstream or the one mid stream pre cat?