got an "error code" today

[bohica-kj]

My check engine light came on after a long trip today. When I parked I did the ignition key check and a code came up:

P0141 HO2S Heater Performance Bank 1 Sensor 2

Is this something I should be concerned with? Or is it one of those BS sensor's that dont really mean anything?

 

[valvestem]

My check engine light came on after a long trip today. When I parked I did the ignition key check and a code came up:

P0141 HO2S Heater Performance Bank 1 Sensor 2

Is this something I should be concerned with? Or is it one of those BS sensor's that dont really mean anything?

Maybe a fluke, but it means the Heated Oxygen Sensor is putting out a code.

 

[bohica-kj]

thanks Valvestem....

Hope its not TOO serious 8-[

I live in S. Korea, so going to the dealer down the street is out....

I'll get it checked as soon as I can.

Do you have any idea if its an engine or if its an exhaust sensor?

I'd like to do some off roadn' this w/e. but this makes me kinda' nervice (Aeh)

 

[valvestem]

O2 Sensor

thanks Valvestem....

Hope its not TOO serious 8-[

I live in S. Korea, so going to the dealer down the street is out....

I'll get it checked as soon as I can.

Do you have any idea if its an engine or if its an exhaust sensor?

I'd like to do some off roadn' this w/e. but this makes me kinda' nervice (Aeh)

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It is both, an engine exhaust temperature sensor. The code being thrown may signify that it is failing. If you have disconnected the negative side of the battery to reset the code, and it still appears on reconnection/restarting, then I'd say it is failing. The diagram will show which one. Being part of an overall engine control system, the sensor is important enough not to let go for too long.

 

[bohica-kj]

Sorry Valvestem,
I got busy and almost forgot to say Thanks for the great info and diagrams!!!!
It really helped out. I waited until I got my Magnaflow install, then crawled under and lightly tapped on the sensors and jiggled the wires a bit. Then disconnected the battery for about a min., and it worked GREAT !! The "check engine" light went away and so did the code \/
I'v put about 200 miles on her since the and it hasnt come back.....hope it dosnt.

THANKS AGIAN !!!!!!

 

[Eddo]

Only, the up stream o2 sensors are important. The down stream o2 sensor just tell the computer if the CATs are working properly. Used as self emission check. You could pull them out and your Jeep would run fine. They don't control the fuel system at all, only the up steam senors do.

 

[bohica-kj]

So my code, "P0141 HO2S Heater Performance Bank 1 Sensor 2", Is a downstream sensor, right?

 

[mx_599]

I am having some of the same issues here in my 2004 Liberty V6. I got some advice from the dood at Autozone and it does not seem to corroborate with that of this thread.

can anyone help me out?

the Autozone code reader says: P0137 Definition HO2S12 circuit condition (heated oxy sensor bank 1 sensor 2)

Explanation: powertrain control module uses the O2 sensor to calculate the air/fuel ratio in the exhaust

per diagram: isn't the one throwing code Left Downstream Sensor (1/2) if I am using diagram correct??

after reading this thread, isn't this the downstream sensor? and if so, someone said this does not affect air:fuel. only the upstream sensors. why did the code print out say it does affect it? I tend to believe the people here than this code reader from Autozone??

Secondly, are these sensors the type of part that either works or does not? is there any failing middle ground where it might be advantageous to just replace it? how about brand? some were like $25 each and another was $50 each?

I did rough calcs of stop 'n go MPG's and it seems to be around 15-16mpg. There is about 105k miles on car.

I was leaning towards replacing both upstream sensors...but according to this print out it seems to be down stream? should I do all 4??

can any offer some advice? thanks! you guys rock :favorites13:

 

[mx_599]

I am having some of the same issues here in my 2004 Liberty V6. I got some advice from the dood at Autozone and it does not seem to corroborate with that of this thread.

can anyone help me out?

the Autozone code reader says: P0137 Definition HO2S12 circuit condition (heated oxy sensor bank 1 sensor 2)

Explanation: powertrain control module uses the O2 sensor to calculate the air/fuel ratio in the exhaust

after reading this thread, isn't this the downstream sensor? and if so, someone said this does not affect air:fuel. only the upstream sensors. why did the code print out say it does affect it? I tend to believe the people here than this code reader from Autozone??

Secondly, are these sensors the type of part that either works or does not? is there any failing middle ground where it might be advantageous to just replace it? how about brand? some were like $25 each and another was $50 each?

I did rough calcs of stop 'n go MPG's and it seems to be around 15-16mpg. There is about 105k miles on car.

I was leaning towards replacing both upstream sensors...but according to this print out it seems to be down stream? should I do all 4??

can any offer some advice? thanks! you guys rock :favorites13:

 

[mx_599]

anyone?

 

[Dave]

Reset it and see if the code comes back. Could just be a fluke.

You are correct.... bank 1 is the drivers side and sensor 2 is the one after the cat. The before the cat sensor controls open/closed loop operation and is more important than the after the cat sensor.

Dave