P0153, P0171, and P0174 trouble codes.

[jordan101]

All these codes pop up. The lean codes are pending and the o2 sensor is the fault. So whats the problem. I think its the o2 sensor or the intake gaskets.

 

[swetrid]

p0153 is o2 sensor slow response. What engine are you working on? It probably has bad intake gaskets or vacuum leak. It still could need o2 sensor but dont replace it yet.

 

[jordan101]

4.0 sohc

 

[BrooklynBay]

Welcome to this forum! I've moved your thread into the EEC-V section.