1998 Chevy Blazer 4-door Vin W

Been hovering here since I bought my Blazer about a year ago and ran into some issues.

Random O2 sensor code popped up on me last month... P0146. Somehow that P0146. Attempted to replace the O2 Sensor and up pops some more codes...

P0135, P0143, P0147, P0155

Somehow I think it has something to do with the wiring.

Any suggestions as far as what I need to be looking for?

On a side problem, P0144 Evap code. From what I can tell it's the generic code meaning that it could be a number of things. Replaced a bunch of rusted steel and broken plastic lines and haven't had a chance to run it long enough for the Evap System to reboot after codes cleared.

Any input here would be greatly appreciated as well!

Thanks in advance!

-Joel

 

All of the DTC's are indicating problems with oxygen sensor circuits, none of them are EVAP DTC's.

What order were the DTC's retrieved? Makes a difference for which one you diagnose first.

Ignition in the RUN position, engine OFF, Check both terminals of each fuse in both fuse panels, (don't remove the fuses when testing them).

 

P0146 was the first. Replaced O2 sensor and all 4 of the other ones came on when I checked my Mac Tools OBD2 reader. I read in one of the threads that my O2 sensor wire should read a certain amount of .XX volts to determine lean/rich ratio and when I checked it it was reading .36 volts.

 

Did you follow the diagnostic flow chart? https://blazerforum.com/forum/diagno...plained-32072/ Did it instruct you to replace B1S3 oxygen sensor? If all you did was replace the post converter sensor, it should have no effect on the upstream sensors. Sounds like there may be some bare wires and or shorted circuits.