0901 fault code + bad ping
09-06-2003, 01:52 AM
#1
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Thread Starter
Join Date: Sep 2003
Posts: 219
0901 fault code + bad ping
I am getting a really bad ping under even light load. I have had a slight ping for about 3 - 4 weeks. I ran the ecu fault codes and got 0901 "Front/Right Htd O2 sensor heater". I am wonder if this is the cause of my knocking. It seems unless it was leaning out really bad it shouldn't cause that bad of a ping. Perhaps I am wrong though it sometimes happens. Anyway if anyone has any help they can offer or insight I would greatly appreciate it. Later
God bless,
dan
God bless,
dan
09-06-2003, 05:51 AM
#2
0901
Diagnostic Trouble Code 0901 points to a problem with the Front Heated Oxygen Sensor, Right Bank. The right cylinder bank is also called the rear bank. It is cylinders 1,3,5.
The Front Heated Oxygen Sensors are installed in the Y-pipe, the part of the exhaust system which conveys exhaust gases from the exhaust manifolds to the Catalytic Converter. There is an Oxygen Sensor in each branch of the Y-pipe. These sensors produce a signal which varies with the concentration of oxygen in the exhaust gas, as compared to the outside air. This signal is sent to the Engine Control Module which uses it to control the fuel injection system.
DTC 0901 is detected when the current drawn by the heating element in the Oxygen Sensor is out of the normal range.
Possible causes include ...
- harness or connectors (the sensor circuit is open or shorted.)
- a defective Front Heated Oxygen Sensor (right bank).
The heated Oxygen Sensors have two components: a heating element and a sensing element. The heating element may be tested with an ordinary ohmmeter. This test is done with the engine off.
Follow the wires away from the Oxygen Sensor until you find the nearest electrical connector. Disconnect the connector. Viewed with the connector latch at the 12 o'clock position, there are three terminals. They are numbered 1-3, right to left. Be sure to measure the terminals in the connector half which is attached to the Oxygen Sensor, not the one which leads to the Engine Control Unit.
Measure the resistance between terminals 1 and 3.
The factory spec is 2.3-4.3 ohms at 77 degrees Fahrenheit.
Measure the resistance between terminals 1 and 2.
The reading should be infinity (no connection).
Measure the resistance between terminals 2 and 3.
The reading should be infinity (no connection).
If the resistance measurements are significantly different from the factory specifications the sensor is faulty and must be replaced.
If the resistance measurements meet the factory specifications the sensor may be good and the wiring is defective. You could exchange the two Front Heated Oxygen Sensors and reset the Engine Control Module. Then drive normally and expect the Malfunction Indicator Lamp to turn on again. If you still get DTC 0901 the wiring is faulty. If you get DTC 1001 the sensor is bad.
that was taken from the thirdlink on http://forums.maxima.org/showthread.php?t=104931 /or my sig ECU CODES DEFINED
Diagnostic Trouble Code 0901 points to a problem with the Front Heated Oxygen Sensor, Right Bank. The right cylinder bank is also called the rear bank. It is cylinders 1,3,5.
The Front Heated Oxygen Sensors are installed in the Y-pipe, the part of the exhaust system which conveys exhaust gases from the exhaust manifolds to the Catalytic Converter. There is an Oxygen Sensor in each branch of the Y-pipe. These sensors produce a signal which varies with the concentration of oxygen in the exhaust gas, as compared to the outside air. This signal is sent to the Engine Control Module which uses it to control the fuel injection system.
DTC 0901 is detected when the current drawn by the heating element in the Oxygen Sensor is out of the normal range.
Possible causes include ...
- harness or connectors (the sensor circuit is open or shorted.)
- a defective Front Heated Oxygen Sensor (right bank).
The heated Oxygen Sensors have two components: a heating element and a sensing element. The heating element may be tested with an ordinary ohmmeter. This test is done with the engine off.
Follow the wires away from the Oxygen Sensor until you find the nearest electrical connector. Disconnect the connector. Viewed with the connector latch at the 12 o'clock position, there are three terminals. They are numbered 1-3, right to left. Be sure to measure the terminals in the connector half which is attached to the Oxygen Sensor, not the one which leads to the Engine Control Unit.
Measure the resistance between terminals 1 and 3.
The factory spec is 2.3-4.3 ohms at 77 degrees Fahrenheit.
Measure the resistance between terminals 1 and 2.
The reading should be infinity (no connection).
Measure the resistance between terminals 2 and 3.
The reading should be infinity (no connection).
If the resistance measurements are significantly different from the factory specifications the sensor is faulty and must be replaced.
If the resistance measurements meet the factory specifications the sensor may be good and the wiring is defective. You could exchange the two Front Heated Oxygen Sensors and reset the Engine Control Module. Then drive normally and expect the Malfunction Indicator Lamp to turn on again. If you still get DTC 0901 the wiring is faulty. If you get DTC 1001 the sensor is bad.
that was taken from the thirdlink on http://forums.maxima.org/showthread.php?t=104931 /or my sig ECU CODES DEFINED
11-06-2003, 11:37 PM
#4
Senior Member
Join Date: Sep 2001
Location: Bergen Cty, NJ
Posts: 116
[QUOTE=kevlo911]0901
Diagnostic Trouble Code 0901 points to a problem with the Front Heated Oxygen Sensor, Right Bank. The right cylinder bank is also called the rear bank. It is cylinders 1,3,5.
The Front Heated Oxygen Sensors are installed in the Y-pipe, the part of the exhaust system which conveys exhaust gases from the exhaust manifolds to the Catalytic Converter. There is an Oxygen Sensor in each branch of the Y-pipe. These sensors produce a signal which varies with the concentration of oxygen in the exhaust gas, as compared to the outside air. This signal is sent to the Engine Control Module which uses it to control the fuel injection system.
After I installed AGX+Eibach, my car had bottomed out several times in driveway and bump. One day, I noticed some kind of heat shield was hanging down, and I finally lost it while I was driving. Several days later, my CEL was on and code was 0901(O2) and 0304(Knock). Is that the one which was covered under heat shield? Many member told me, heat shield is not neccessary except parking in pile of leaves because of fire hazard. I guess not..
Do I need to replace O2 sensor? I heard it's very expensive. Also, do I need to purchase heat shield and re-install it? I am worry beacause it will be gone anyway after several bottom out experience. What do you think?
Do I need to change it right away? I was thinking about getting Y-pipe next Spring, and can't afford any other Mod after spending for suspension..
Diagnostic Trouble Code 0901 points to a problem with the Front Heated Oxygen Sensor, Right Bank. The right cylinder bank is also called the rear bank. It is cylinders 1,3,5.
The Front Heated Oxygen Sensors are installed in the Y-pipe, the part of the exhaust system which conveys exhaust gases from the exhaust manifolds to the Catalytic Converter. There is an Oxygen Sensor in each branch of the Y-pipe. These sensors produce a signal which varies with the concentration of oxygen in the exhaust gas, as compared to the outside air. This signal is sent to the Engine Control Module which uses it to control the fuel injection system.
After I installed AGX+Eibach, my car had bottomed out several times in driveway and bump. One day, I noticed some kind of heat shield was hanging down, and I finally lost it while I was driving. Several days later, my CEL was on and code was 0901(O2) and 0304(Knock). Is that the one which was covered under heat shield? Many member told me, heat shield is not neccessary except parking in pile of leaves because of fire hazard. I guess not..
Do I need to replace O2 sensor? I heard it's very expensive. Also, do I need to purchase heat shield and re-install it? I am worry beacause it will be gone anyway after several bottom out experience. What do you think?
Do I need to change it right away? I was thinking about getting Y-pipe next Spring, and can't afford any other Mod after spending for suspension..
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