p0133 code on Corolla

I don't know about the idle problem, but that sensor has been updated somewhere around 2003. It may be possible that your vehicle got an older design sensor, but not likely. Regardless, you should check with a Toyota dealer to see if they will cover the repair for you -- O2 sensors are covered 3/36 in most states, 3/50 in the green states.

You could have a slow sensor element, a weak heater, or high wiring resistance. The computer has not failed the heater circuit or you would also have a P0125, but that doesn't rule out an underperforming heater or wiring issue.

Toyota MDT in MO

Thanks.

I'm in Canada and past 3/36 anyway.

Heater? Does the 02 sensor have a heater or are you refering to a MAF heater? I think the corolla has a resistance-based MAF.

Steve

"Steve" wrote in news: snipped-for-privacy@news.alcatel.com:

The oxygen sensor itself has a heater, to make sure its element stays over

Oxygen sensors need to be above 500F to start working, and to be at 750F to be fully effective. Old-style single-wire oxygen sensors relied on the exhaust gas itself to heat them up. As legislated emissions limits dropped, this method became inadequate, so a heater was added to the sensor body, along with dedicated ground wires to ensure electrical integrity.

But doesn't this car have a A/F sensor rather than an O2 sensor? If so, the heater is even more necessary. A/F sensors run at 1,500F, a temperature impossible to maintain relying on exhaust heat alone.

All good info.

Nope, just pre and post O2 sensors.

I am hoping for the day that sensors such as knock and TPS get heaters as well. I'm always worried that they'll catch cold.

Toyota MDT in MO