Posted by Bob on January 04, 2014 at 14:15:38 from (64.255.159.192):
In Reply to: O2 sensor posted by Chris Jones on January 04, 2014 at 13:29:36:
First of all, if it is CCCCOLD where you are, I would clear the code and see if it returns
On your truck, bank 2 is RH/passenger"s side.
The front sensors provide feedback for the fuel control system.
The "2" sensors (Bank 1 sensor 2 and Bank 2 sensor 2), behind the "cats" report cat efficiency to the emissions warning system and DON"T/CAN"T control the fuel, so if there is NO code for the front sensor, it is strictly an EMISSIONS problem, NOT an engine or fuel system problem
Your PO161 code specifically points to the HEATER circuit that warms the sensor so the system can go closed loop.
I would ASSUME the computer keeps tack of the time, after startup, how long it takes the sensor to "come on line" (heat up and produce a signal), and if that takes too long or does not occur at all the code will be set.
Condensed moisture in the exhaust system, or snow and ice caked under the vehicle can cause this,m as well as a failed sensor or a problem in the heater supply circuit.
So, it"s NOT an emergency-engine"s-gonna-die situation, and I would clear it and not get too excited about it "til warmer weather and IF it re-occurs.
If you are NOT subject to emissions testing in your state, considering the vehicle is 13 years old and you MAY not want to start throwing a lot of $$$ at it, you can have someone with a "tuner" program (such as HP Tuners) simply tell the "puter to IGNORE the rear O2 sensors.
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