ECU Code on 99 Max
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Joined: Sep 2003
Posts: 49
ECU Code on 99 Max
My check engine light came on on the other day. I pulled the codes and got 0313. I looked it up and there is no definition for it. I then reset the CEL and it came on 2 days later and I proceeded to pull the code and got the same 0313. does anybody have a clue of what it could be? Thanks!
Thread Starter
Member
Joined: Sep 2003
Posts: 49
ECU Code 0313
Anybody have a clue?
Originally Posted by Adam Cramer
My check engine light came on on the other day. I pulled the codes and got 0313. I looked it up and there is no definition for it. I then reset the CEL and it came on 2 days later and I proceeded to pull the code and got the same 0313. does anybody have a clue of what it could be? Thanks!
This is an excerpt from a post by a former member, Daniel B. Martin:
Diagnostic Trouble Code 0313 points to a problem with the Rear Heated Oxygen Sensor. This sensor is mounted in the exhaust stream, just downstream of
the Catalytic Converter. When the two Front Heated Oxygen Sensors are operating properly the Rear Heated Oxygen Sensor is not used for engine control operation. It is used to monitor the condition of the Catalytic Converter. If either (or both) Front Sensors fail, the Engine Control Module uses the signal from the Rear Sensor to maintain a correct fuel/air mixture.
DTC 0313 is detected when the signal from the Rear Heated Oxygen Sensor does not reach the expected maximum voltage threshold value. The possible causes include ...
- Harness or connectors (the sensor circuit is open or shorted.)
- Rear Heated Oxygen Sensor
- Fuel pressure
- Fuel injectors
- Intake air leaks
Diagnostic Trouble Code 0313 points to a problem with the Rear Heated Oxygen Sensor. This sensor is mounted in the exhaust stream, just downstream of
the Catalytic Converter. When the two Front Heated Oxygen Sensors are operating properly the Rear Heated Oxygen Sensor is not used for engine control operation. It is used to monitor the condition of the Catalytic Converter. If either (or both) Front Sensors fail, the Engine Control Module uses the signal from the Rear Sensor to maintain a correct fuel/air mixture.
DTC 0313 is detected when the signal from the Rear Heated Oxygen Sensor does not reach the expected maximum voltage threshold value. The possible causes include ...
- Harness or connectors (the sensor circuit is open or shorted.)
- Rear Heated Oxygen Sensor
- Fuel pressure
- Fuel injectors
- Intake air leaks
Most likely the sensor is bad... you can find good prices on a replacement at www.oxygensensors.com. Get an OEM equivalent - so you don't have to mess around with splicing the harness etc. Your old one may be difficult to get out (from rust). Get the car nice and hot, and soak the old sensor with PB Blaster... let it sit for a few hours - then try to get it off... or take it to a muffler shop and pay them 10 bucks to break it loose for you.
Once you have the sensor replaced just reset the ECU (procedure is in the stickies) and you should be good to go.
Once you have the sensor replaced just reset the ECU (procedure is in the stickies) and you should be good to go.
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ballerchris510
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Sep 10, 2015 09:35 PM