2doorblazer

hello new here.
I have a 98 2door 2wd blazer (W vin) i got the p0420 code about the o2 is bad. The one b4 the cat. Is there a way to clean to it or should i just get a new one. Cat an muffler are less then a year old. Magna flow cat an muffler. Thanks for any help 2doorblazer

Siliconasp

A code P0420 may mean that one or more of the following has happened:

• Leaded fuel was used where unleaded was called for
• An oxygen sensor is not reading (functioning) properly
• The engine coolant temperature sensor is not working properly
• Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
• Retarded spark timing
• The oxygen sensors in front and behind the converter are reporting too similar of readings

98, sensor is 11 years old, I would recommend replacement. cost about $35.00 to $65.00 depending on your location. look online for cheaper deal.

You can pull the O2 sensor and clean it with a cloth to remove carbon buildup and try running again for 1 tank of gas. This can save you some money.

---WARNING---
DO NOT ATTEMPT TO USE ANY TYPE OF SOLVENT ON THE SENSOR ITSELF, AS THIS CAN CAUSE IT TO FAIL. IF THE CARBON BUILDUP IS MAJOR, REPLACE IT.

2doorblazer

i took out the front o2 an it looked like a good fireing plug color. i took a small tourch an heated it up an wiped it off with a rag. put it back in an the light came right back on. i cleared the computer buy undoing the neg battery post. also cleaned tps,iac??? the one next to the tps. on the drivers side. thanks 2doorblazer