Fuel running rich and spluttering from exhaust
- Thread starter ABS
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CH Lancer O2 Sensor Error Code Decompilation
Some useful info. for others based on the error codes I got....
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CODE001: P0136 Oxygen sensor (rear)
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 pulse width 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.
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
Source: http://www.obd-codes.com/p0136
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CODE002: P0135 Oxygen sensor (front) heater
Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
What does that mean?
This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.
Symptoms
You will likely notice poor fuel economy the illumination of the MIL.
A code P0135 may mean that one or more of the following has happened:
•O2 Heater element resistance is high
•Internal short or open in the heater element
•O2 heater circuit wiring high resistance
•open or short to ground in the wiring harness
Possible Solutions
•Repair short or open or high resistance in wiring harness or harness connectors
•Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
Source: http://www.obd-codes.com/p0135
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CODE003: P0141 Oxygen sensor (rear) heater
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
What does that mean?This code means that the heated circuit in the oxygen sensor on bank 1 decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0141. See also: P0135 (Bank 1, Sensor 1).
Symptoms
You will likely notice poor fuel economy the illumination of the Check Engine Light.
A code P0141 may mean that one or more of the following has happened:
•open or short to ground in the wiring harness
•O2 heater circuit wiring high resistance
•O2 heater element resistance is high
•Internal short or open in the heater element
Note: Typically a failed catalytic converter does not cause this code. You're more likely to see a P0420 code for a failed converter.
Possible Solutions
•Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
•Repair short or open or high resistance in wiring harness or harness connectors
Source: http://www.obd-codes.com/p0141
Some useful info. for others based on the error codes I got....
______________________________________________________________________________________
CODE001: P0136 Oxygen sensor (rear)
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 pulse width 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.
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
Source: http://www.obd-codes.com/p0136
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CODE002: P0135 Oxygen sensor (front) heater
Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
What does that mean?
This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.
Symptoms
You will likely notice poor fuel economy the illumination of the MIL.
A code P0135 may mean that one or more of the following has happened:
•O2 Heater element resistance is high
•Internal short or open in the heater element
•O2 heater circuit wiring high resistance
•open or short to ground in the wiring harness
Possible Solutions
•Repair short or open or high resistance in wiring harness or harness connectors
•Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
Source: http://www.obd-codes.com/p0135
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CODE003: P0141 Oxygen sensor (rear) heater
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
What does that mean?This code means that the heated circuit in the oxygen sensor on bank 1 decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0141. See also: P0135 (Bank 1, Sensor 1).
Symptoms
You will likely notice poor fuel economy the illumination of the Check Engine Light.
A code P0141 may mean that one or more of the following has happened:
•open or short to ground in the wiring harness
•O2 heater circuit wiring high resistance
•O2 heater element resistance is high
•Internal short or open in the heater element
Note: Typically a failed catalytic converter does not cause this code. You're more likely to see a P0420 code for a failed converter.
Possible Solutions
•Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
•Repair short or open or high resistance in wiring harness or harness connectors
Source: http://www.obd-codes.com/p0141
Turned out manifold o2 sensor was bent 
(dunno if it affected fuel economy etc.)
Replaced and cleared the codes....hoping it will improve fuel economy by a bit at least.
BEFORE: I calculated it at 16.6L/100km (50L full tank divided by approx.. 300km distance travelled before empty tank)
AFTER: Pending....
(dunno if it affected fuel economy etc.)Replaced and cleared the codes....hoping it will improve fuel economy by a bit at least.
BEFORE: I calculated it at 16.6L/100km
(50L full tank divided by approx.. 300km distance travelled before empty tank)AFTER: Pending....
nope max is roughly 300km unless fuel sender unit has malfunctioned, showing incorrect readings on the fuel gauge. That's the only thing I can think of right now. Or possibly fuel filter but its only done 69,000kms :?
In the last 12months, I've changed air filter, oil/oil filter every 6months, 4 iridium spark plugs and now manifold o2 sensor.
In the last 12months, I've changed air filter, oil/oil filter every 6months, 4 iridium spark plugs and now manifold o2 sensor.
dingle86
New Member
Just on this - after throwing on some extractors in mid 2011 I pretty much fried my manifold o2 sensor within the first 5 minutes of driving and the CEL came on. Got a code reader from ebay for $15 and it told me exactly what was wrong. Then got a Universal sensor from ebay for about $49. Came with instructions, connectors and shrink wrap. You do have to cut the original wiring loom and re-wire to the new sensor. 10 minutes later - cleared the code and all good to go!
Changed out the CAT sensor mid last year to try and keep them both around the same age. Same sensor from ebay for $49. My 4g69 only has 2 sensors.
Changed out the CAT sensor mid last year to try and keep them both around the same age. Same sensor from ebay for $49. My 4g69 only has 2 sensors.