SES Codes 0300, 0141 HELP Again PLease

[blazee]

Let me see if I can clear this up. You guys are talking about different things.

rksnc is talking about a normal oxygen sensor system, with three sensors and single exhaust pipe. This is the same one that I have and everyone else that I have seen. This system includes:

One sensor just below the driver's side manifold - Bank 1 Sensor 1
One sensor just below the passenger side manifold - Bank 2 Sensor 1
One sensor just after the cat - Bank 1 Sensor 2 (The proper way to refer to it) or Bank 2 Sensor 2 (although not the proper way to refer to it this is sometimes used.)


BlazerLT is talking about a system that some of these Blazers are rumored to have. (I have yet to see one, but it has been mentioned on here several times) The system he is talking about would consist of 4 oxygen sensors:

One sensor just below the driver's side manifold - Bank 1 Sensor 1
One sensor just below the passenger side manifold - Bank 2 Sensor 1
One sensor just before the cat - Bank 1 Sensor 2 aka Bank 2 Sensor 2
One sensor just after the cat - Bank 1 Sensor 3 aka Bank 2 Sensor 3

All that being said...I believe the rumor about some Blazers having 4 sensors is just that...a rumor. The only systems (to date) that I know of having 4 sensors would be those with dual exhaust. These systems consist of the following:

One sensor just below the driver's side manifold - Bank 1 Sensor 1
One sensor just after the driver's side cat - Bank 1 Sensor 2
One sensor just below the passenger's side manifold - Bank 2 Sensor 1
One sensor just after the passenger's side cat - Bank 2 Sensor 2

[blazee]

I should add... the references to which side of the engine is bank 1 and bank 2 is based on GM design.

[BlazerLT]

It is not a rumour or they would not have codes to dilineate that sensor being there.

It is no a rumour that several people here have 4 O2 sensors.

Please stop treating it like it is an urban legend or something.

[blazee]

I could be wrong about it being a rumor, that is why I didn't say you were wrong. I'm just saying that it has been said here many times, but I haven't seen anyone yet that had 4 sensors.

[BlazerLT]

Originally Posted by blazee

I could be wrong about it being a rumor, that is why I didn't say you were wrong. I'm just saying that it has been said here many times, but I haven't seen anyone yet that had 4 sensors.

I have seen many people who replaced all four sensors.

The manifold O2 sensors check the reading coming off of the two banks.

The one before the cat is for the air/fuel ratio and the one after the cat is a catalyst monitor and is also used for long term fuel trim.