How to check O2
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TECH Apprentice
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Joined: Sep 2006
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From: Northern, VA
How to check O2 I have a code, forget the number exactly, that says Bank 1 Sensor 1 heater malfunction, that's driver side right? I don't have rear O2s, they have been tuned out. How do I check the millivoltage of the sensor? I couldn't find it on a search.
Heater codes can have two causes. One is an actual bad heater
circuit or element. The other is, the sensor just doesn't start
switching soon enough to suit the PCM's liking. That could be
crust, bent mixture, long tube headers in winter or whatever.
Heater wires do get damaged or burnt, but unless there has
been recent undercar work I think this is not as likely as the
simple aging & environment scenario.
circuit or element. The other is, the sensor just doesn't start
switching soon enough to suit the PCM's liking. That could be
crust, bent mixture, long tube headers in winter or whatever.
Heater wires do get damaged or burnt, but unless there has
been recent undercar work I think this is not as likely as the
simple aging & environment scenario.
