There are several things to check most of the time you will need to replace the catalitic converter, this is common enough that the dealer still stocks the parts, also the upstream and down stream sensors must be calibrated after you replace the cat. BE VERY CAREFUL not to confuse the o2 sensors when thay are removed,
Could be a diesel? If not then replace your oxygen sensor on your exhaust. A bad oxygen sensor causes the exhaust smoke to be dark in color.
Check for exhaust leaks, test oxygen sensor operation, replace the catalytic converter.Check for exhaust leaks, test oxygen sensor operation, replace the catalytic converter.
In 1990-1994 XJ6 the VCM Code 44 is the code for the O2 sensor, either rich or lean exhaust has been detected and is causing the code to trigger. It could indicate a bad O2 sensor.
The O2 sensor on a Honda Civic is found on the exhaust system. It will be mounted near the catalytic converter. Simply unscrew the sensor from the exhaust pipe and unplug it from the wire harness. Replace with a new unit.
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The O2 sensor is located on the exhaust system there might be more then one
Your O2 sensors have detected too much oxygen in the exhaust, clean the MAF sensor, a dirty one is the most probable cause. If you are using an aftermarket ( oiled ) air filter too much oil will foul the sensor.
Exhaust Gas Recirculation Sensor "A" Circuit High. Replace Sensor The sensor is part of the egr valve. Replace the valve.
Losen the exhaust cross over and take off temp sensor
Just unplug the electrical connector and then unscrew the oxygen sensor out of the exhaust pipe.
Sensor is in the exhaust usually near the exhaust manifold. V engines will have at least two and newer cars may have more than two. Once you get to the sensor replacement is unhooking the electrical connection and unscrewing the sensor. You then screw in new sensor and reconnect.
Replace the upstream O2 sensor which is on the exhaust manifold