I had my CEL on since I got my motor put back in and cant get rid of the codes. I have vibrant header,vibrant catted dp and 3'' vibrant exhaust. I also have a wideband not that it should matter..But i have replaced both of the 02 sensors, the codes are
P0133 Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0171 System too Lean (Bank 1)
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P1133 HO2S Insufficient Switching

If anyone could help that would be great thanks

 

Are you tuned? What are your other mods?

 

sounds like u have an exhaust leak. probably where the header bolts up. run some sea foam thru a vaccum line and watch for smoke to leak somewhere. may have a clogged cat.

 

well i was tuned and then the motor popped. my brother in law works at a chevy dealership and put a used motor in and then reflashed the ECU back to stock...only mods are h/dp/e/clutch and flywheel.

good idea but the exhaust is only 5 months old but i will do that and see thanks

 

That's an issue with the primary O2. If you already replaced the sensor and it's still throwing codes it's time to take it to the dealer to check the wiring.

 

Good call on the exhaust leak...checked my exhaust today and sure enough there the bolt was hanging where the dp and header met..fixed and and cleared the codes...so far i drove over 100 miles and no cel on

 

i have the high fuel purge pressure code that wont go away lol.

 

what code # is that?

 

honestly i dont know. but i just ignor it lol.