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Old 04-29-2011, 10:38 AM   #1
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02 sensor help quick!

I'm throwing a code in my jeep for a 02 sensor behind the cat. What trouble can that cause am I gonna do awful on gas?!

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Old 04-29-2011, 10:52 AM   #2
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I would start with a fill up on gas incase it is contaminated and change the spark plugs if it does not clear within a reasonable amount of time. When was your last tune-up? Plugs/Filters/Oil/Etc...

Its not a question of why the sensor is bad, its a question of what is the sensor detecting in my exhaust gasses causing it to read trouble?

-peace

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Old 04-29-2011, 10:55 AM   #3
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The pre catalytic converter O2 sensor monitors how the engine is managing the air/fuel mixture. The post catalytic converter O2 sensor monitors how the cat is functioning. In early OBDII engines the post cat O2 simply monitored the cat's effeciency. Later model OBDII O2 post sensors actually aid in managing the air/fuel ratio but to a less extent than the pre cat O2.
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Old 04-29-2011, 11:12 AM   #4
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My jeeps an 04 I did plugs about 10k miles ago... Seems to be running good any way to TEST the 02 sensor to see if that it....my jeep has 100k on it and I've never replaced one
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Old 04-29-2011, 11:25 AM   #5
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Just replace the O2 sensor and you won't spend your time chasing problems. Be sure to use the MOPAR sensor, the Bosch ones don't play well with the Wrangler. It's only $67 (online hunting) and worth every penny!
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Old 04-29-2011, 11:27 AM   #6
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These simple steps should be followed whenever testing O2 sensors.
Scan the vehicle for any O2 sensor codes and analyze the data stream PID. O2 sensor voltage should cycle normally with proper amplitude and frequency. An O2 sensor stuck at a fixed bias voltage is an indication of an open O2 circuit or lack of O2 sensor (dedicated) ground. If possible use a graphing multi-meter to analyze the O2 sensor data to determine any possible problems.
While reading the scan values, goose the throttle and observe for O2 sensor minimum and maximum values (0.1x volts to 0.9x volts). Although this is not a conclusive evidence of correct O2 sensor operation, it serves as a preliminary indication of proper operation.
Some automotive manufacturers employ a dedicated O2 sensor ground wire that is grounded somewhere at the engine block or chassis. A loss or rupture of this ground wire will render the O2 sensor useless. This ground wire feeds only the ECM’s O2 sensor circuit. The main engine ground does not feed this type of O2 sensor circuit.
Verify the O2 sensor wire integrity. Most O2 sensors are biased and an open signal wire will give a reading of whatever the bias voltage is. Later model Jeep/Chrysler O2 circuits tend to be biased at around 2 or 4 volts, therefore, a constant reading of around 2 or 4 volts on a Chrysler is also an indication of an open circuit. In many of these cases, the ECM will put an “O2 sensor High Voltage” code.
Finally, verify for correct O2 sensor operation with a scope or graphing multi-meter. Check for proper amplitude and frequency. Remember that the scanner O2 sensor readings are only interpreted values and may not show the real voltage reading. This is the reason for doing this final manual test.
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Old 04-29-2011, 11:28 AM   #7
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I agree though. It would probably just be easier to put in a new one and eliminate that as a suspect.
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Old 05-08-2011, 01:27 PM   #8
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My tj was throwing o2 sensor codes for about a week. Took her off road yesterday and it went out. Poor gal just wanted it rough!!

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