Closed loop fueling and O2 sensor codes after cam and lifter replacement.

[Mdh406]

Just finished cam and lifter replacement on a 2014 and now I’m getting codes for both my downstream o2 sensors and it won’t achieve closed loop on both banks.
It starts and runs good and I used a scantool to confirm my timing and it says everything is fine there.
The only thing I noticed is that it still has a little bit of a tick but I’m not sure if it’s just the new lifters that a need a few heat cycles or I messed something up.
Should note that I never took anything apart related to o2 sensors.

 

[Ben22]

Curious what the fix for this might be. I’m having the same issue. P0158 P0152 P1129 for me. New o2 sensors didn’t solve issue either. Did you trace your harness for any damage yet?

 

[Bigskyroadglide]

Did you purchase new OEM sensors or aftermarket.

I've had to replace my O2 sensors on bank 2 sensors 1 & 2 and until I used oem, the problem did not resolve.

I don't know why but I know oem fixed the issue . They were about $20 more expensive than aftermarket per sensors.

 

[Sherman Bird]

Curious what the fix for this might be. I’m having the same issue. P0158 P0152 P1129 for me. New o2 sensors didn’t solve issue either. Did you trace your harness for any damage yet?

Replacing sensors or other parts as an attempt to make a repair geared toward that code is extremely risky. Scanners do NOT tell you WHAT component to replace, they tell you what code, thus control system needs DIAGNOSIS.

Your way of "fixing" is pure shotgun guess work. That gets very expensive and time consuming. No one on this forum can diagnose over the phone, so to speak.

Find a shop with a good diagnostician. Pay for that. Then, you can make an accurate repair if you so desire.
Forgive my breviloquence.

 

[Ben22]

Replacing sensors or other parts as an attempt to make a repair geared toward that code is extremely risky. Scanners do NOT tell you WHAT component to replace, they tell you what code, thus control system needs DIAGNOSIS.

Your way of "fixing" is pure shotgun guess work. That gets very expensive and time consuming. No one on this forum can diagnose over the phone, so to speak.

Find a shop with a good diagnostician. Pay for that. Then, you can make an accurate repair if you so desire.
Forgive my breviloquence.

I mean, I just paid $6k for a new engine, stage 2 cam, and edge torque converter, so a couple hundred bucks for new sensors and 20minutes of my time didn’t feel like an extremely risky repair to me. Definitely not pure shotgun guesswork either. My next course of action is to check for an exhaust leak or MAP sensor issue. did the entire swap myself. I enjoy time under the hood.

I thought the point of these forums was to find solutions through hive mind, but if yours is “go pay someone to find your problem” I’m not mad at that! Just figured someone else has probably already gone down this road and found a potential solution. Thanks for your help.

 

[Ben22]

Replacing sensors or other parts as an attempt to make a repair geared toward that code is extremely risky. Scanners do NOT tell you WHAT component to replace, they tell you what code, thus control system needs DIAGNOSIS.

Your way of "fixing" is pure shotgun guess work. That gets very expensive and time consuming. No one on this forum can diagnose over the phone, so to speak.

Find a shop with a good diagnostician. Pay for that. Then, you can make an accurate repair if you so desire.
Forgive my breviloquence.

Also breviloquence is a heck of a spelling bee word!

 

[Mdh406]

I did find my problem, when I took stuff apart to replace cam and lifters I removed the two big connectors in the control module on firewall
And when I put them back in I didn’t get them locked in tight enough and that’s what caused my problems.

 

[Ben22]

Ah,The PCM connectors? Definitely worth a check. Thanks.