2000 Blazer with a mess of codes
 

Well, i'm selling my Blazer to a good friend so I can buy a truck. I have had a CEL for a little while and never made a huge deal to get it checked. Well I had it checked today, and it came up 5 codes.

P0131 P0132 P0134 P0135 P1133

All of these appear to be focused around a bad 02 sensor, and a recently installed K&N which was very oily and could have caused the MAF sensor to go out. Also they all appeared in Bank 1

What can I do to fix this??? Just replace the one 02 sensor, and clean the MAF?? Any tips or suggestions would be wonderful

Thank!!!

P0131 - HO2S Circuit Low Voltage Bank 1 Sensor 1
P0132 - HO2S Circuit High Voltage Bank 1 Sensor 1
P0134 - HO2S Circuit Insufficient Activity Bank 1 Sensor 1
P0135 - HO2S Heater Circuit Bank 1 Sensor 1
P1133 - HO2S Insufficient Switching Bank 1 Sensor 1

That's a lot of codes for one O2 sensor. I would check to see if the wiring is proper and then switch O2 sensors side to side and see if the codes follow the sensor. They likely will.

If you have to replace the sensor, pull all of your plugs and at the very least check/clean them if not just replace them. A bad O2 sensor can foul plugs.

Sounds great. Thanks alot.