a few questions about 02sensors and tire size
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Three Wheeling
Joined: Aug 2010
Posts: 75
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From: tx
a few questions about 02sensors and tire size
(96 5 spd 4.0)
would i be able to temporarily extinguish my check engine light by disconecting my battery and re-connecting it to pass state inspection?
also is driving with a bad o2 sensor bad for your disco?
and would 245/75/16 tires fit without a lift (some trimming is alright)
i have heard that they would, just wanted a second opinion
thanks
would i be able to temporarily extinguish my check engine light by disconecting my battery and re-connecting it to pass state inspection?
also is driving with a bad o2 sensor bad for your disco?
and would 245/75/16 tires fit without a lift (some trimming is alright)
i have heard that they would, just wanted a second opinion
thanks
TReK
Joined: Mar 2008
Posts: 2,306
Likes: 3
From: Woodstock, GA
no, the testing machine will tell them you just disconnected the battery and they'll tell you to come back when the obdII is ready which could be a few hundred miles.
depends on which o2 sensors..pre-cat or post-cat?
depends on which o2 sensors..pre-cat or post-cat?
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Three Wheeling
Joined: Aug 2010
Posts: 75
Likes: 0
From: tx
im not sure i just got this code P1187 Oxygen Sensor Heater Circuit Short Upstream
Rock Crawling
Joined: Aug 2010
Posts: 323
Likes: 10
A. I run 275/70/R16 with no problems and saggy original stock springs. These tires have a diameter of 29.5". 275/75/R16 tires have a diameter of 30.5", meaning only 0.5" more to fit under the fenders, which seems reasonable given the room that still remains. You may have to adjust the steering stops a bit; it is pretty close on mine.
B. There are four O2 sensors in your truck. Two are pre cat and actually effect how the comp runs the mixture, two are post cat and are there only to measure the delta across the cats.
If you drive with the post-cat sensors bad, you will do nothing bad to your vehicle other than get a check engine light, and a code indicating poor cat performance.
If you drive with the pre-cat sensor bad, however, evil expensive things can happen to your converter. Typical failure of the sensor leads to a weak signal from the transducer, which in turn makes the ECU think you are running wicked lean. Lean=HOT so the ECU starts dumping gas to try to correct the situation. Raw gas = death to cats, they get VERY hot and the internal structure breaks down, causing the honeycomb to turn into gravel and jangle around inside the pipes. Not to mention the vast quantities of cash your now ridiculously thirst beast will require.
Code P1187 Oxygen Sensor Heater Circuit Short Upstream - your O2 sensor has a separate wire in it that heats up as part of its operation, and there is a dead short in the circuit. It may still function, but at reduced capacity, and not for long. It is the upstream sensor, so you should really replace it.
B. There are four O2 sensors in your truck. Two are pre cat and actually effect how the comp runs the mixture, two are post cat and are there only to measure the delta across the cats.
If you drive with the post-cat sensors bad, you will do nothing bad to your vehicle other than get a check engine light, and a code indicating poor cat performance.
If you drive with the pre-cat sensor bad, however, evil expensive things can happen to your converter. Typical failure of the sensor leads to a weak signal from the transducer, which in turn makes the ECU think you are running wicked lean. Lean=HOT so the ECU starts dumping gas to try to correct the situation. Raw gas = death to cats, they get VERY hot and the internal structure breaks down, causing the honeycomb to turn into gravel and jangle around inside the pipes. Not to mention the vast quantities of cash your now ridiculously thirst beast will require.
Code P1187 Oxygen Sensor Heater Circuit Short Upstream - your O2 sensor has a separate wire in it that heats up as part of its operation, and there is a dead short in the circuit. It may still function, but at reduced capacity, and not for long. It is the upstream sensor, so you should really replace it.
Last edited by geek_IM; Dec 14, 2010 at 11:09 PM. Reason: added code explaination
Camel Trophy
Joined: Feb 2007
Posts: 4,959
Likes: 11
From: Tulsa, OK
I run 245/75 and they fit great. No trimming and no rub. You may have to adjust your steering stops because they rub on the frame at full lock a little...
I have no lift, but have new factory springs and Bilstein shocks. The tires don''t rub at full flex for me...
I have no lift, but have new factory springs and Bilstein shocks. The tires don''t rub at full flex for me...
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Three Wheeling
Joined: Aug 2010
Posts: 75
Likes: 0
From: tx
A. I run 275/70/R16 with no problems and saggy original stock springs. These tires have a diameter of 29.5". 275/75/R16 tires have a diameter of 30.5", meaning only 0.5" more to fit under the fenders, which seems reasonable given the room that still remains. You may have to adjust the steering stops a bit; it is pretty close on mine.
B. There are four O2 sensors in your truck. Two are pre cat and actually effect how the comp runs the mixture, two are post cat and are there only to measure the delta across the cats.
If you drive with the post-cat sensors bad, you will do nothing bad to your vehicle other than get a check engine light, and a code indicating poor cat performance.
If you drive with the pre-cat sensor bad, however, evil expensive things can happen to your converter. Typical failure of the sensor leads to a weak signal from the transducer, which in turn makes the ECU think you are running wicked lean. Lean=HOT so the ECU starts dumping gas to try to correct the situation. Raw gas = death to cats, they get VERY hot and the internal structure breaks down, causing the honeycomb to turn into gravel and jangle around inside the pipes. Not to mention the vast quantities of cash your now ridiculously thirst beast will require.
Code P1187 Oxygen Sensor Heater Circuit Short Upstream - your O2 sensor has a separate wire in it that heats up as part of its operation, and there is a dead short in the circuit. It may still function, but at reduced capacity, and not for long. It is the upstream sensor, so you should really replace it.
B. There are four O2 sensors in your truck. Two are pre cat and actually effect how the comp runs the mixture, two are post cat and are there only to measure the delta across the cats.
If you drive with the post-cat sensors bad, you will do nothing bad to your vehicle other than get a check engine light, and a code indicating poor cat performance.
If you drive with the pre-cat sensor bad, however, evil expensive things can happen to your converter. Typical failure of the sensor leads to a weak signal from the transducer, which in turn makes the ECU think you are running wicked lean. Lean=HOT so the ECU starts dumping gas to try to correct the situation. Raw gas = death to cats, they get VERY hot and the internal structure breaks down, causing the honeycomb to turn into gravel and jangle around inside the pipes. Not to mention the vast quantities of cash your now ridiculously thirst beast will require.
Code P1187 Oxygen Sensor Heater Circuit Short Upstream - your O2 sensor has a separate wire in it that heats up as part of its operation, and there is a dead short in the circuit. It may still function, but at reduced capacity, and not for long. It is the upstream sensor, so you should really replace it.
im guessing that could that explain the rich smell from the exhaust and horrible gas mileage im getting thank you for your help
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Three Wheeling
Joined: Aug 2010
Posts: 75
Likes: 0
From: tx
thanks i guess ill go ahead and order the tires
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