I have to get an emissions test in IL.

My check engine light is on, but when i went to see what the code could be I was a little confused.

05 10 was what i got.

There were 5 long pulses and 10 short pulses.

Can someone help me out on this one. I'm at a lost.

I was able to reset the ecu, but I'm still curious about that code.

Thanks in advance.

My 99 is kickin strong with 175K miles on it

 

This is right out of the ECU sticky.

0510
Diagnostic Trouble Code 0510 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 0510 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


Basically replace the O2 sensor that is in the exhaust system after the catalytic converter (i.e. between the catalytic converter and muffler).

 

Thanks for the info, will get that taken care of.

Passed the emission test