Damn. CEL P0159 P0139
11-02-12, 06:41 PM
#46
Lexus Test Driver
Damn it i just threw P0139 and P0159 and P0136 and P0156
Help!!!!!!!
I also noticed that my car was really loud before it threw the codes.
Help!!!!!!!
I also noticed that my car was really loud before it threw the codes.
Last edited by zapa; 11-02-12 at 07:17 PM.
11-02-12, 07:02 PM
#47
Lexus Test Driver
P0136 OBD-II Trouble Code
Technical Description
Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
What does that mean?
Essentially the same as P0137, a P0136 code refers to the second oxygen sensor on Bank 1. The O2 oxygen sensor produces a voltage between .1 mV and .9 mV. The ECM monitors O2 sensor voltage and determines if exhaust is lean or rich. O2 sensor voltage is high when exhaust is rich and low when exhaust is lean. The ECM monitors this voltage and increases or decreases fuel injector pulsewidth according to engine fuel/air ratio. If the ECM detects low HO2Sensor voltage for an extended period, it will set P0136 Conditions required to set: HO2 sensor voltage is low for longer than 2 minutes (minutes depend on model of vehicle. Could be up to 4 minutes)
Symptoms
There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.
Causes
A code P0136 may mean that one or more of the following has happened:
• Faulty O2 sensor leak in exhaust close to O2 sensor
• Short to voltage on O2 signal circuit
• Open in circuit resistance caused by corrosion in connector
Possible Solutions
• Replace the second oxygen sensor on bank 1
• Repair open or short in signal circuit
Clean corrosion from connector
P0139 OBD-II Trouble Code
Technical Description
Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)
What does that mean?
This involves the rear oxygen sensor on the driver's side. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.
Symptoms
You will likely not notice any drivability problems, although there may be symptoms.
Causes
A code P0139 may mean that one or more of the following has happened:
• The oxygen sensor is faulty
• The wiring to the sensor is broken / frayed
• There is an exhaust leak
Possible Solutions
P0156 O2 Sensor Circuit Malfunction
OBD-II Trouble Code Technical Description
02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
What does that mean?
The o2 (oxygen) sensors measure oxygen content in the exhaust. The PCM (powertrain control module) then uses this information to regulate fuel injector pulse. The o2 sensors are very important for the proper operation of the engine. Innacurate or faulty o2 sensors can cause the PCM to add or take away fuel based on the faulty o2 sensor voltage which can cause a host of problems.
A P0156 code refers to the Bank 2,2 o2 sensor or the downstream (post-cat) o2 sensor on Bank 2. It is a four wire sensor. The PCM supplies a ground circuit and a reference voltage circuit of about 0.5 volts. Also for the o2 sensor heater element there is a battery voltage supply wire and another ground circuit for that. The o2 sensor heater allows the o2 sensor to warm up faster, thus achieving closed loop in less time than it would normally take for the exhaust to warm the sensor up to operating temperature. The O2 sensor varies the supplied reference voltage based on oxygen content in the exhaust. It is capable of varying from about 0.1 to 0.9 volts, 0.1 V indicating lean exhaust and 0.9 V indicating rich exhaust. This P0156 code indicates that the Bank 2, 2 o2 sensor is stuck low for too long or isn\'t active at all.
Symptoms
Often post-cat o2 sensor problems present few symptoms since they are inputs to the PCM to monitor catalytic converter quality and don\'t directly control fuel. sometimes no symptoms are noticeable. However the following may be possible on some vehicles:
• MIL (Malfunction Indicator Lamp) illumination
• Decrease in MPG
• Increase in tailpipe emissions
Causes
Potential causes of an P0156 code include:
• Bad O2 sensor
• Signal shorted to voltage
• Wiring problems due to contact with exhaust components
• Holes in exhaust near o2 sensor
P0159 OBD-II Trouble Code
Technical Description
Oxygen Sensor Circuit Slow Response (Bank2, Sensor2)
What does that mean?
This involves the rear oxygen sensor on the passenger side. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.
Symptoms
You will likely not notice any drivability problems, although there may be symptoms.
Causes
A code P0159 may mean that one or more of the following has happened:
• The oxygen sensor is faulty
• The wiring to the sensor is broken / frayed
• There is an exhaust leak
Possible Solutions
The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the rear passenger side oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
• Check and fix any exhaust leaks
• Check for wiring problems (shorted, frayed wires)
• Check the frequency and amplitude of the oxygen sensor (advanced)
• Check for a deteriorating / contaminated oxygen sensor, replace if necessary
• Check for inlet air leaks
• Check the MAF sensor for proper operation
Technical Description
Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
What does that mean?
Essentially the same as P0137, a P0136 code refers to the second oxygen sensor on Bank 1. The O2 oxygen sensor produces a voltage between .1 mV and .9 mV. The ECM monitors O2 sensor voltage and determines if exhaust is lean or rich. O2 sensor voltage is high when exhaust is rich and low when exhaust is lean. The ECM monitors this voltage and increases or decreases fuel injector pulsewidth according to engine fuel/air ratio. If the ECM detects low HO2Sensor voltage for an extended period, it will set P0136 Conditions required to set: HO2 sensor voltage is low for longer than 2 minutes (minutes depend on model of vehicle. Could be up to 4 minutes)
Symptoms
There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.
Causes
A code P0136 may mean that one or more of the following has happened:
• Faulty O2 sensor leak in exhaust close to O2 sensor
• Short to voltage on O2 signal circuit
• Open in circuit resistance caused by corrosion in connector
Possible Solutions
• Replace the second oxygen sensor on bank 1
• Repair open or short in signal circuit
Clean corrosion from connector
P0139 OBD-II Trouble Code
Technical Description
Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)
What does that mean?
This involves the rear oxygen sensor on the driver's side. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.
Symptoms
You will likely not notice any drivability problems, although there may be symptoms.
Causes
A code P0139 may mean that one or more of the following has happened:
• The oxygen sensor is faulty
• The wiring to the sensor is broken / frayed
• There is an exhaust leak
Possible Solutions
P0156 O2 Sensor Circuit Malfunction
OBD-II Trouble Code Technical Description
02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
What does that mean?
The o2 (oxygen) sensors measure oxygen content in the exhaust. The PCM (powertrain control module) then uses this information to regulate fuel injector pulse. The o2 sensors are very important for the proper operation of the engine. Innacurate or faulty o2 sensors can cause the PCM to add or take away fuel based on the faulty o2 sensor voltage which can cause a host of problems.
A P0156 code refers to the Bank 2,2 o2 sensor or the downstream (post-cat) o2 sensor on Bank 2. It is a four wire sensor. The PCM supplies a ground circuit and a reference voltage circuit of about 0.5 volts. Also for the o2 sensor heater element there is a battery voltage supply wire and another ground circuit for that. The o2 sensor heater allows the o2 sensor to warm up faster, thus achieving closed loop in less time than it would normally take for the exhaust to warm the sensor up to operating temperature. The O2 sensor varies the supplied reference voltage based on oxygen content in the exhaust. It is capable of varying from about 0.1 to 0.9 volts, 0.1 V indicating lean exhaust and 0.9 V indicating rich exhaust. This P0156 code indicates that the Bank 2, 2 o2 sensor is stuck low for too long or isn\'t active at all.
Symptoms
Often post-cat o2 sensor problems present few symptoms since they are inputs to the PCM to monitor catalytic converter quality and don\'t directly control fuel. sometimes no symptoms are noticeable. However the following may be possible on some vehicles:
• MIL (Malfunction Indicator Lamp) illumination
• Decrease in MPG
• Increase in tailpipe emissions
Causes
Potential causes of an P0156 code include:
• Bad O2 sensor
• Signal shorted to voltage
• Wiring problems due to contact with exhaust components
• Holes in exhaust near o2 sensor
P0159 OBD-II Trouble Code
Technical Description
Oxygen Sensor Circuit Slow Response (Bank2, Sensor2)
What does that mean?
This involves the rear oxygen sensor on the passenger side. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.
Symptoms
You will likely not notice any drivability problems, although there may be symptoms.
Causes
A code P0159 may mean that one or more of the following has happened:
• The oxygen sensor is faulty
• The wiring to the sensor is broken / frayed
• There is an exhaust leak
Possible Solutions
The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the rear passenger side oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
• Check and fix any exhaust leaks
• Check for wiring problems (shorted, frayed wires)
• Check the frequency and amplitude of the oxygen sensor (advanced)
• Check for a deteriorating / contaminated oxygen sensor, replace if necessary
• Check for inlet air leaks
• Check the MAF sensor for proper operation
04-25-13, 05:35 PM
#51
Others with the codes, did you end up clearing up the issues? Getting my headers put on this weekend, still a little bit nervous on it. Is it fair to say that the issues either stem from an exhaust leak, a improper wiring of the O2 conditioner, or a malfunction of the O2 sensors to some degree? Anything specific you guys have learned from experience to make note for the installer Thanks.
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