P0172 and P0175 2008 Tahoe

[lspann3525]

Well Im back again my truck has been running pretty good with no oil leaks since the rear main seal replacement. But I am now getting a P0172 and P0175. While putting the truck back together the only thing I was curious that I didn't connect correctly was the 2 oxygens sensors on the passenger side because both connectors were so close together...so basically I probably have the upstream o2 sensor connected to the downstream o2 connector... do the upstream and downstream o2 sensor use the same connector as well

 

[swathdiver]

The electrical connectors are different but you can thread them into the same holes if the wires are long enough. I'd get that fixed quick before it kills the cats.

 

[lspann3525]

Ok cool they should be connected correctly. The only o2 that was removed was the passenger side top to get to the exhaust nut.

 

[lspann3525]

Update: The other morning I started the truck and the engine light was off. However the next day or 2 the check engine light came on

 

[lspann3525]

Ive been doing a little research and I see that these engines have a high pressure fuel pump under the intake manifold that can cause the p0172 and p0175. Is there a way to confirm there is a problem with the high pressure fuel pump??? like if it's leaking or something??

 

[Geotrash]

Ive been doing a little research and I see that these engines have a high pressure fuel pump under the intake manifold that can cause the p0172 and p0175. Is there a way to confirm there is a problem with the high pressure fuel pump??? like if it's leaking or something??

There is no high pressure fuel pump under the manifold. Not sure where that one came from.