Heat rated O2 sensor???? which one?
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
Heat rated O2 sensor???? which one?
Hi
i´m struggling in sensor problem getting these codes p0135 and p0155 and te car drives bad on low rpms....
i think i need new "better" heat rated o2 sensors and i´m leaning to these Bosch 13111
Are they the best or are there others that rate better.... ?
thanks
Baezi
i´m struggling in sensor problem getting these codes p0135 and p0155 and te car drives bad on low rpms....
i think i need new "better" heat rated o2 sensors and i´m leaning to these Bosch 13111
Are they the best or are there others that rate better.... ?
thanks
Baezi
Le Mans Master
Joined: Apr 2005
Posts: 8,077
Likes: 4
From: Scarborough ONTARIO
Drives bad because ECM not in closed loop, i check your sig, you have headers and lots other mods, make ssure 02 sensor fuses are OK under hood fuse block, hook up EFIlive or HP tuners and see if 02 sensor readings switching back n forth from .1-.8 volts, closed loop or open loop? BTW if no luck than check the voltage of 12 volts on one of last pin of connector, its a 4 wire O2 sonsor harness connector with Key ON Engine ON, thats heated circuit pin and may be not getting power from ign source and so not heating sensor and so not going into closed loop.
If you have not turned off rear O2's than its about time turn them off, and sorted out front one's at the same time.
If you have not turned off rear O2's than its about time turn them off, and sorted out front one's at the same time.
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
Drives bad because ECM not in closed loop, i check your sig, you have headers and lots other mods, make ssure 02 sensor fuses are OK under hood fuse block, hook up EFIlive or HP tuners and see if 02 sensor readings switching back n forth from .1-.8 volts, closed loop or open loop? BTW if no luck than check the voltage of 12 volts on one of last pin of connector, its a 4 wire O2 sonsor harness connector with Key ON Engine ON, thats heated circuit pin and may be not getting power from ign source and so not heating sensor and so not going into closed loop.
If you have not turned off rear O2's than its about time turn them off, and sorted out front one's at the same time.
If you have not turned off rear O2's than its about time turn them off, and sorted out front one's at the same time.
I have no rear sensors ..
but the question is why is all my sensors fauling...
Baezi
Safety Car
Joined: Dec 2004
Posts: 3,526
Likes: 20
From: Santa Fe TX
Check for exhaust leaks near the O2 sensor and check for unmetered air entering the intake after the Mass Air Flow Sensor.
If the PCM sees extra air that hasn't come through the MAF, it will temporarily go lean, then dump in a bunch of fuel to compensate. This causes poor driveability and bad gas mileage.
If the PCM sees extra air that hasn't come through the MAF, it will temporarily go lean, then dump in a bunch of fuel to compensate. This causes poor driveability and bad gas mileage.
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
Check for exhaust leaks near the O2 sensor and check for unmetered air entering the intake after the Mass Air Flow Sensor.
If the PCM sees extra air that hasn't come through the MAF, it will temporarily go lean, then dump in a bunch of fuel to compensate. This causes poor driveability and bad gas mileage.
If the PCM sees extra air that hasn't come through the MAF, it will temporarily go lean, then dump in a bunch of fuel to compensate. This causes poor driveability and bad gas mileage.
how is the best way of knowing that it isn´t air leak, unmetered air going threw can´t find any thing by looking, and it does idel fine so..... ??
thanks
Baezi
Heel & Toe
Joined: Jan 2010
Posts: 22
Likes: 0
From: Grand Rapids MI
So, it drives rough when those CEL's are on, but how about when you reset them using the (options/fuel 4x)? I am getting 1133 and 1153 if i remember correct, front sensors have gone bad I think.
When I reset the CEL, it drives nicely. What is the PCM doing behind this? Am I hurting anything?
When I reset the CEL, it drives nicely. What is the PCM doing behind this? Am I hurting anything?
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
So, it drives rough when those CEL's are on, but how about when you reset them using the (options/fuel 4x)? I am getting 1133 and 1153 if i remember correct, front sensors have gone bad I think.
When I reset the CEL, it drives nicely. What is the PCM doing behind this? Am I hurting anything?
When I reset the CEL, it drives nicely. What is the PCM doing behind this? Am I hurting anything?
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Safety Car
Joined: Dec 2004
Posts: 3,526
Likes: 20
From: Santa Fe TX
I have a cam and tune and I thought the same thing for 2 years. See I had a professional install the cam, then some jackass (me) installed the Vararam, longtubes, LS6 intake, heads etc.
Last month I found a crooked donut gasket at the collector, right before the hi flo cats and right next to the o2 sensor.
I also found that a clamp had been too tight and caused one of the plastic air bridge peices to deform and let air in through the bottom where you couldn't see it.
My advice is to take off everything between the MAF and throttle body and inspect it for cracks, funky clamp joints, or other irregularities.
It ran funny all that time, and from time to time, it would throw this or that 02 code and I'd try to fix it. Sometimes 6-7 months with no codes.
It runs much better now. I'm just keeping my fingers crossed that the o2 codes don't return anytime soon.
Last month I found a crooked donut gasket at the collector, right before the hi flo cats and right next to the o2 sensor.
I also found that a clamp had been too tight and caused one of the plastic air bridge peices to deform and let air in through the bottom where you couldn't see it.
My advice is to take off everything between the MAF and throttle body and inspect it for cracks, funky clamp joints, or other irregularities.
It ran funny all that time, and from time to time, it would throw this or that 02 code and I'd try to fix it. Sometimes 6-7 months with no codes.
It runs much better now. I'm just keeping my fingers crossed that the o2 codes don't return anytime soon.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
What is the HEATER VOLTAGE (ignition on engine OFF) and what is the ground wire reading (OHMS) for the heater circuit (pin C "black wire" to chassis ground ) ????
Bill C
Bill C
Last edited by Bill Curlee; Apr 7, 2010 at 01:07 AM.
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
high 11,98V
low 4,42V
but what should i see on black wire C to chassis ground?
Baezi
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
Tech Contributor
Joined: Jan 2007
Posts: 19,566
Likes: 1,209
From: Dyer, IN
No that's not normal. It should be a direct short to ground (very low ohms). Based on that reading, you have a problem. If all sensors read the same with reference to ground, the issue is most likely at the splice pack.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Mike
I think he was reading back thru the sensor. He has 4 readings.
You only need the readings from the harness connector from the PCM to ground. If that is zero, your fine.
As for the LOW heater voltage, how did you read that?You should be reading the pin D in the connector harness that comes from the PCM to ground.
The 11.98 VDC looks fine.
You can read the HEATER element of each O2 sensor on pins C to D on the sensor pigtail, They should both be close to each other
BC
I think he was reading back thru the sensor. He has 4 readings.
You only need the readings from the harness connector from the PCM to ground. If that is zero, your fine.
As for the LOW heater voltage, how did you read that?You should be reading the pin D in the connector harness that comes from the PCM to ground.
The 11.98 VDC looks fine.
You can read the HEATER element of each O2 sensor on pins C to D on the sensor pigtail, They should both be close to each other
BC
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
