U0223 Code:

OBD-II Diagnostic Network (U) Trouble Code

Possible Cause

Common Symptoms

  1. If the resistance level does not decrease with heat and increase as it cools, replace the sensor. If everything has checked out thus far, turn the key to the "ON" position and test for the presence of a voltage (and a ground signal) at the exhaust gas temperature/pressure (or heated oxygen) sensor electrical connector
  2. This will help to determine whether or not the malfunction is intermittent. After the codes are cleared, test drive the vehicle to see if the code returns
  3. If the fluid smells or appears burned, remove the transmission pan and check for the presence of clutch material and other debris
  4. Should all system circuitry and sensors check out and the transmission is in good working order, suspect a faulty PCM but keep in mind that PCM failure is rare and PCM replacement will require reprogramming.

Similar Problems

Fuel And Air Metering
Exhaust Gas Recirculation System Valve 1
A/C System High Pressure High Temperature

U0223 Troubleshooting

There will also be noise coming from the turning radiator fan and the belt that turn the fan blade. There are a multiple of other belt driven devices under the hood. An engine pulley is mounted to the engine of an automobile and drives all belts. Your car probably has a serpentine belt which is a continuous belt used to drive multiple peripheral devices. U0223 the main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit.

How to turn off U0223 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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