Rear O2 sensor issue. - Toyota Nation Forum : Toyota Car and Truck Forums

***JavaJoe_2*** · 03-28-2008, 06:52 AM

I have a 2000 S/C Camry with JPP headers. I had tapped into the ECU to install a CP-e intake and tuning box, but have since taken it out of the equation. The problem lies with the rear O2 sensor. When I check it with my OBDII and monitor the sensor, it shows that it has not monitoring. All of my other sensors are green (monitoring), but the Catalyst monitor (rear O2). I have replaced the cat and the sensor to no avail. I am at a loss for what to try now.
Any ideas?

Kep · 04-11-2008, 01:10 PM

Have you trouble shot (boy that sounds like a wrong word!) the wiring from the sensor to the ECM?

Kep

***JavaJoe_2*** · 04-11-2008, 11:07 PM

It turned out to be the tube from the rear header to the egr cooler. It had a broken in half. The O2 sensor it right next to it. The sensor probably read lean, so it was giving it more fuel. That is why I was not able to pass emissions. The extra fuel (I think) cooled down the after-cat sensor, so it would not light up.
I fixed the tube and all is well!
BTW, Thank You Kep for your reply....the only one.