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BigBlock434, Chevy Mechanic
Category: Chevy
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Experience:  ASE Master certified and 100% General Motors trained in all fields
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10 blazer: im getting a p0135 code which is for the heated o2 circut.

Resolved Question:

i have a 2002 chevy s-10 blazer. i'm getting a p0135 code which is for the heated o2 circut. there are three 02 sensors. which one is giving me the code?
Submitted: 7 years ago.
Category: Chevy
Expert:  BigBlock434 replied 7 years ago.
In order to find out which sensor is giving you trouble the vehicle must be below operating temp.(preferably at cold start up). You must have a on board scanner that can command sensors on and off. Turn ignition key on and command o2 heaters on and observe the sensor reading to determine which sensor heater is not working.
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