I just replace my KS last weekend and today my check light came on. Pulled the codes and 0307 comes up Closed Loop Control, what is this? also code 0509 ame up which comes up undefined in the ECU decoder. Anybody with advice? Please Help.

 

The meaning of that is: your oxygene sensor have not reach his normal fonction temperature in time and your pcm cannot be in closed loop.

Closed loop means that it's your O2 sensor who is controlling the air/fuel mixture to explain it the simple way.

Perhaps your heating circuit for your O2 sensor is faulty.

 

hey nkumke im sorry to steal ur thread but whitemax96 would you know how to solve a 0702 code issue? if so can u please pm me the answer

 

0307
Diagnostic Trouble Code 0307 points to a problem with the Engine Control Module Closed Loop Logic for the Left Bank. The left cylinder bank is also called the front bank. It is cylinders 2,4,6.

DTC 0307 is detected when the closed loop control function for the left bank does not operate even when the vehicle conditions meet the criteria (engine at normal operating temperature, etc.). Possible causes include ...
- Harness or connectors (The sensor circuit is open or shorted.)
- a defective Front Heated Oxygen Sensor sensing element.
- a defective Front Heated Oxygen Sensor heater.

 

can u also get thsi code if u get exhaust leak from header to y-pipe connection. This code popped up with new 02 sensors which i'll exchange under warranty but i have major exhaust leak in that area and just wondering if that could effect temperature and whatnot.