P0137 and p0430

[Coops75]

Hi everyone. 2005 v6 (although engine is from a 2011 v6) I replaced the two upstream o2 sensors and now a couple days later I have these two codes. I went through past posts but not sure if anyone ended up fixing them. Can anyone tell me this 1st code, is it the passenger side after cat o2 sensor? Any ideas on the second code? Thanks

P0137 o2 sensor circuit low voltage bank 1 circuit 2

P0430 catalyst system efficiency below threshold bank 2

 

[catrains]

Hi everyone. 2005 v6 (although engine is from a 2011 v6) I replaced the two upstream o2 sensors and now a couple days later I have these two codes. I went through past posts but not sure if anyone ended up fixing them. Can anyone tell me this 1st code, is it the passenger side after cat o2 sensor? Any ideas on the second code? Thanks

P0137 o2 sensor circuit low voltage bank 1 circuit 2

P0430 catalyst system efficiency below threshold bank 2

P0137 ,,,the upstream O2 sensor on the driver side is with a low output signal voltage that means exhaust has too much oxygen in it. could also be a bad sensor or wiring ..B1S2.........you did not install properly leak at the sensor threads !exhaust leak ..

B2S2 p0430 code is the O2 sensor is not producing a proper signal which indicates the passenger side converter is running too cold.

reading the signal waveform helps to troubleshoot this . scan tools I purchased for $200 works very good to show the waveforms .

using a voltmeter is hard because of voltage swings on the O2 sensors.

 

[Coops75]

Thanks for the reply.I had a shop replace the upstreams for me, the one that just replaced my engine. Maybe loose connection or the threads like you said. Or maybe loose vacuum line somewhere.
I do have a good scantool that I borrowed. Not sure how to check what I need. But I'll try to figure it out

 

[Coops75]

Actually after looking p0137 bank 1 sensor 2 is a downstream sensor not one of the upstream I had replaced. Don't know why this one suddenly gives me problems? Maybe it's reading something bad from one of the upstream ones?

 

[AuSeeker]

Could it be that the garage that installed them bought inferior/cheap sensors?

 

[Coops75]

I got the sensors and they're good but the code now isn't for the sensors they replaced, it looks like it's for another one. Didn't have any codes before the engine replacement.