CEL's and general inquiry
08-01-2008, 08:37 PM
#1
CEL's and general inquiry
I've got these CEL's...
P0036
P0133
P0140
If they are the same as the ones that I deleted earlier this week, then they are about the O2 Sensor and the O2 Sensor Heater... or some trash like that. I had a few more pop up earlier this week too, but they don't seem to have come back. They are obviously for the O2 in the Exhaust Manifold (O2 #1), as I had my tuner deactivate all the CEL's for the downpipe O2 sensor (O2 #2).
Question #1... I removed O2 #2 and put my Wideband in its place. Can I replace O2 #1 with my old O2 #2? I don't know much about them... but I would assume that they are the same.
Question #2... if O2 #1 is indeed bad, will it really effect anything other than throwing a CEL? Cause if it doesn't really do anything... then I'm not gonna change it.
The O2 sensors on are cars are one thing that I really don't know TOO much about.
P0036
P0133
P0140
If they are the same as the ones that I deleted earlier this week, then they are about the O2 Sensor and the O2 Sensor Heater... or some trash like that. I had a few more pop up earlier this week too, but they don't seem to have come back. They are obviously for the O2 in the Exhaust Manifold (O2 #1), as I had my tuner deactivate all the CEL's for the downpipe O2 sensor (O2 #2).
Question #1... I removed O2 #2 and put my Wideband in its place. Can I replace O2 #1 with my old O2 #2? I don't know much about them... but I would assume that they are the same.
Question #2... if O2 #1 is indeed bad, will it really effect anything other than throwing a CEL? Cause if it doesn't really do anything... then I'm not gonna change it.
The O2 sensors on are cars are one thing that I really don't know TOO much about.
08-01-2008, 10:16 PM
#2
Senior Member
Heres some info for you
HDTC P0136
Circuit Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The powertrain control module (PCM) supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the PCM operates in open loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and closed loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust stream.
The HO2S 2 is used for catalyst monitoring. This diagnostic runs once per ignition cycle. This diagnostic consists of 2 tests, a passive test and an intrusive test. During the passive test, if the HO2S 2 voltage transitions below 300 mV and above 700 mV, the DTC will pass for this ignition cycle. If the DTC does not pass during the passive test, the intrusive test will begin. During the intrusive test, the control module will force the air-to-fuel ratio rich and/or lean. The control module then waits for a predicted response from both sensors. If the HO2S 2 voltage transitions below 300 mV and/or above 700 mV, the DTC will pass for this ignition cycle. If the control module does not receive the expected response from the HO2S 2, DTC P0136 will
eres some info
HDTC P0136
Circuit Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The powertrain control module (PCM) supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the PCM operates in open loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and closed loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust stream.
The HO2S 2 is used for catalyst monitoring. This diagnostic runs once per ignition cycle. This diagnostic consists of 2 tests, a passive test and an intrusive test. During the passive test, if the HO2S 2 voltage transitions below 300 mV and above 700 mV, the DTC will pass for this ignition cycle. If the DTC does not pass during the passive test, the intrusive test will begin. During the intrusive test, the control module will force the air-to-fuel ratio rich and/or lean. The control module then waits for a predicted response from both sensors. If the HO2S 2 voltage transitions below 300 mV and/or above 700 mV, the DTC will pass for this ignition cycle. If the control module does not receive the expected response from the HO2S 2, DTC P0136 will
eres some info
08-20-2008, 10:02 AM
#5
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I'm surprised this hasn't been answered yet.
First... yes, both sensors are the same. If your not using the rear one, you can indeed change it out with the front one.
Second... yes... the front O2 does more than just flash CEL's. It's part of your closed loop system. It needs to be in working condition for the vehicle to run properly. Haven't you been noticing any strange AFR's at cruising speeds? If you have... it's probably attributed to that sensor shitting the bed.
First... yes, both sensors are the same. If your not using the rear one, you can indeed change it out with the front one.
Second... yes... the front O2 does more than just flash CEL's. It's part of your closed loop system. It needs to be in working condition for the vehicle to run properly. Haven't you been noticing any strange AFR's at cruising speeds? If you have... it's probably attributed to that sensor shitting the bed.
08-20-2008, 09:03 PM
#7
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If your getting a code for no o2 activity, recheck your connections, but furthermore, if the stock o2's are narrowband (i dont know if they are or not) and you put in a wideband, i'd see why the PCM would have a shitfit. One of those codes is telling you its not seeing it switch from lean to rich fast enough, which sounds like a car used to seeing it pop from neg to pos in a pretty fast manner, whereas with a wideband would react (my opinion) slow in the PCMs eyes. Guess and check as far as I'm concerned, working at a dealer for years I know for a fact we'd tell you to put the stock sensor back in first.
Just my two cents.
Just my two cents.
08-21-2008, 01:25 PM
#8
If your getting a code for no o2 activity, recheck your connections, but furthermore, if the stock o2's are narrowband (i dont know if they are or not) and you put in a wideband, i'd see why the PCM would have a shitfit. One of those codes is telling you its not seeing it switch from lean to rich fast enough, which sounds like a car used to seeing it pop from neg to pos in a pretty fast manner, whereas with a wideband would react (my opinion) slow in the PCMs eyes. Guess and check as far as I'm concerned, working at a dealer for years I know for a fact we'd tell you to put the stock sensor back in first.
Just my two cents.
Just my two cents.
The O2 sensor connected to the Exhaust Manifold is the one giving me problems. My question has already been answered though. I'm just gonna take my old Lower O2 sensor and swap it into the Upper's place.
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