I was told that the engine code is P0147 Bank 1 Sensor 3. What in the world does that mean? Which O2 sensor is it? I think there are 4.

Any help is appreciated.

Thanks,

Brian

 

Yup, Heater Circuit Bank 1 Sensor 3. On your '99 (please make sure to include that information in your posts so I don't have to dig for it), this is the post cat sensor. This has nothing to do with fuel delivery and is only used for catalyst monitoring. The first thing I would suggest is to have the codes cleared and see if it comes back.

If it does come back and you had some time to waste, you could swap it with one of the upstream sensors and see if the code follows it. If it does, then the sensor itself is bad and needs replacing. If it doesn't follow the sensor, then you may have some problems with the wiring. By swapping the sensor into one of the upstream locations, you could cause your fuel mileage to suffer during this test.

If you find that the sensor is bad, I recommend an AC Delco replacement sensor. NTK is also another good sensor, but hard to find. For the downstream sensor, you could probably get away with a Bosch, but one should not be used in the upstream locations. I have had nothing but bad and short lived experiences with Bosch sensors in a GM vehicle.

And for your year, there are only 3. In '98 they consolidated the B1S2 sensor into the B1S1&B2S1 sensors through averaging in the PCM programming for the catalyst monitoring functions.

 

I have an 2002 Blazer, but I have a P0155 code, do you recommend the same action? Swaping out sensors that is? Also, do you have the bank nomeclature and location for each of the senors?

 

P0155 - O2 Sensor Heater Circuit (B2S1)

You could try swapping the B2S1 (passenger side upstream) sensor with the B1S1 (driver side upstream) and reset the codes to see if the code follows the sensor. Basically, swap the passenger side and driver side sensors that are in front of the catalytic converter.

 

Hey, just a heads up, about four months ago I had the same code thrown on my Blazer. Then about a month later I ended up having a butt load of work done, new spider assembly, new plugs, wire, rotor, cap, and all new sensors, plus my catalytic converter got eaten up from my engine running extremely rich. So just watch, and if you detect any hint of misfire then I would recommend taking a look at everything, may save you, it hit me hard to get everything fixed. But that code being thrown was the begining of my problems.

 

Swapped out the the two forward O2 sensors and code followed the suspected bad sensor from a P0155 to a P0135. Got an AC Delco sensor and installed. Had AutoZone dump my computer and seem to fix the problem. Thanks for all your assistance.

 

Glad we could help!