sam hain

Got a CEL this morning about Catalyst System Efficiency Below Threshold. I assume my O2 sensor and/or converter is bad. How hard are these things to change?

sam hain

Was told I could try cleaning the front O2 sensor and maybe not to have buy anything.

Lost Again

If you try to clean it, I'm willing to bet you will kill it.

Tune up items up to date (plugs), any exhaust leaks. Is the front O2 getting lazy?

sam hain

Yes tune up is recent, wires were good put plugs in about 15k miles ago. Car runs great, avgs 29mpg, good power too. I may just replace the sensor, I can stand $35.

bigballer8526

make sure you stick to denso/ngk. Hondas only love those two sensors.

I don't think any of those two sensors would be 35, maybe a bosch which I would avoid.
a rear ngk/denso sensor is like 50-60 and a front one is a 100.

DCFIVER

Is the vehicle in fuel control? Are the fuel trims good? If so you need a cat....