Maybe the cat is stopped up?

 

Is it a 96?

 

Yeah it's a96 and i just had a new cat put on

 

OK that explains my confusion. I was looking at OBDI. Well the answer to the codes then is pretty simple. One says the sensor is stuck lean and he other says the heating circuit is bad. So test the wires for voltage ground and connectivity and check resistance on the sensor. However for my time and the price of a sensor I would replace the guy anyway after taking the time to pull it. Make sure you clean the ground. Its possible that the welding damaged the sensor when you had the cat replaced. On OBDII a bad cat sensor will effect driveability and even force the system into default mode.

 

I thought the sensor behind the cat didnt do nothing beside let you know if the cat is good or not

 

This is correct.

The sensors in front of the cat read the exhaust and can effect drive ability. The sensor after the cat only tells the ecu if the cat is functioning correctly and that's it. That after cat sensor could be unplugged and the only thing that would happen is a CEL and a code set, it would not cause the engine to run any different.

 

The sensor behind the cat on OBDII reads the Cat. It also verifies the operation if the egr, secondary air, and EVAP systems. If the readings are out if the expected range the computer attempts to compensate to bring emissions back into range. On OBDII systems the engine will not run properly without the cat sensor working properly. OBDII was designed specifically to meet emissions standards required in 1996. Its first mission in life is to make sure the vehicle does not violate emissions standards or it will shut down to default mode or disable the engine completely.

 

Good info,smart.

 

Awesome so hopefully that will fix my issue I'm thinking when the cat went bad it burned up that sensor so the very back o2 is the one I need to replace right?

 

Yeah. Hopefully that will fix the issue but it is the first problem we know is wrong so that's the place to start.