CEL came on the other week in my '99 Camry (with the 2.2L), and as an old VW owner I ignored it, thinking it was the EGR code it had last year. Nope, new one: P0136, for the second O2 sensor. Quick look reveals it could be bad sensor, or an air leak... I could have an air leak, as the flex pipe looks bad--but when I checked I didn't feel any leakage and it certainly doesn't sound loud. I sometimes think I smell exhaust but perhaps it's just oil burning off.
I hooked up Torq and looked. The "O2 1x2" readout appears stuck at zero. As in, zero volts. ? This seems very odd. I cleared the code and have put 50 miles, one cold start and a few hot starts onto it--and the light hasn't come on again. Yet. But the whole drive to work, Torq was indicating zero volts. I'm thinking Torq isn't reading this sensor correctly. It should throw codes and run bad with a seemingly dead O2 output. But all the same, old sensors, code... probably ok to just shotgun replacement?
I did look at the first sensor, and got some plots; I was surprised that it swings when under light load / maintaining highway speed.
To be honest, idle looked the same.
I didn't grab a shot of heavy load though.
I hooked up Torq and looked. The "O2 1x2" readout appears stuck at zero. As in, zero volts. ? This seems very odd. I cleared the code and have put 50 miles, one cold start and a few hot starts onto it--and the light hasn't come on again. Yet. But the whole drive to work, Torq was indicating zero volts. I'm thinking Torq isn't reading this sensor correctly. It should throw codes and run bad with a seemingly dead O2 output. But all the same, old sensors, code... probably ok to just shotgun replacement?
I did look at the first sensor, and got some plots; I was surprised that it swings when under light load / maintaining highway speed.
To be honest, idle looked the same.
I didn't grab a shot of heavy load though.