"check Engine" Light Is On

[olegf]

ES300, 98, 87K.

"Check engine" light is on. I checked the gas tank cap, it's

tight. Car runs good.

My mechanic read error code - PO135 "HO2S Heater Circut

Malfunction, Bank 1 Sensor 1".

It's $160 sensor + labor.

I wander if readings on non-Lexus equipment can be trusted, or I need to go to Lexus dealer for diagnostics?

Thanks.

[SW03ES]

Naa thats reliable.

[steviej]

see my reply to this post in your other thread. I can't help wonder if this recent failure was related to your recent throttle body cleaning.

sj

[Raptor 22]

Check the resistance between pins on the heating element of the sensor (pins 1 & 2 I think). At aft bank, near firewall, disconnect sensor and read there, I believe resistance should be between 6 and 11 ohms. I currently have same issue with the wife's, plan on changing tomorrow. I had same code and have open circuit.

[JPI]

Your mechanic is right.

JPI