There are several types of O2 Sensor codes. There can be "Lean O2 Sensor" codes, "Rich O2 Sensor" codes, "O2 Sensor Slow Response" codes, or "O2sensor Heater Circuit" codes. The specific code that is being set changes the way you must go about diagnosing and repairing the problem. I will say however, that in about 80% of all the O2 Sensor code problems that I have had to diagnose, the O2 Sensor itself was NOT the problem. The O2 Sensor was only reporting a problem that was actually caused elsewhere. O2 Sensors are the final checkpoint in the engine management system. I think of them like a report card. If the O2 Sensors are right, the rest of the engine management system is right. If the O2 Sensors are not right, the rest of the engine management system is probably not right. (Except in the 20% of the cases where the problem is actually being caused by a failed O2 Sensor)
See also the solution on this page by pczapp.
He is correct. Nobody should drive their car for a year with the "Check Engine" or "Service Engine Soon" light on. It may seem to be running OK to you, but it is most likely harming some pretty expensive engine, exhaust and emissions components.
I get cars like this in my shop all the time. By the time the customer brings the car in it is either because the car won't run anymore or the vehicle is due for an emissions inspection and now it is full of codes and is going to cost big bucks to fix it.
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You never got what caused the check light to come on,
fixed a year ago,maybe other issues
OBD2 System Emission lights,something everyone
should study,do not stay on. They are govt mandated,
so you will get on it in a few days. They don't come and
arrest you,but your vehicle should be diagnosed and repair,
then and now
If you have a bad O2 Sensor Heater, you could chance
replacing it.
Bank 1 ,right side, first sensor,closest to engine,in exhaust
converter.
Any other O2 codes need testing,never replacing without it.
I would get a real professional opinion or as I said,if a heater
goes,so does the sensor,a rare case where you could risk
the money and do yourself
22mm wrench or7/8" both the same
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Why 2001 pajero io neutral light blinks while the vehicle is driving and the temperature guage increase?
A worn out O2 sensor that will need to be troubleshot and replaced by a qualified shop.
Either the first O2 sensor is bad or the wiring to the O2 sensor is bad most likely the the bank 1 sensor is bad in most cases replacing that particular O2 fixes the issue.
SOURCE: Code p0141 02 Sensor Heater Circuit Malfunct Bank #1 Sensor2
after the catalytic converter on the driver side in the exhaust pipe.
Testimonial: "Awesome info. Thanks!"
SOURCE: 02 heater circuit bank one
There is a 02 fuse for these. if they all went out this is the most likely culptrit.
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