Please guys I need help, my Corolla is consuming too much fuel. I've done all my possible best but no solution.

*I've replaced both catalyst
*Change plugs
But two things I noticed that are not working are:
* The thermostat have been removed and the fan runs whenever I put on the ignition.
* Idle air control switch not working.
I've changed more than 3 injector heads still the idle air control valve refuse to respond. I'm confused. Please somebody should help

Engine

02 senor is likely the culprit

PJwise:
Please guys I need help, my Corolla is consuming too much fuel. I've done all my possible best but no solution.

*I've replaced both catalyst
*Change plugs
But two things I noticed that are not working are:
* The thermostat have been removed and the fan runs whenever I put on the ignition.
* Idle air control switch not working.
I've changed more than 3 injector heads still the idle air control valve refuse to respond. I'm confused. Please somebody should help

Why can't you guys scan before replacing parts and wasting money?

The codes will point out the issue

I have done that already. I have this scanner which I'm using to diagnose my car. The codes use to be, oxygen sensor bank 1, but I've replaced the two catalyst and service the sensors. That problem is gone. But the code remaining and refused to go after replacing the part is:
Idle air control valve. Read my initial post.
The thermostat has been removed and the code is there too but my mechanic said removal of thermostat can not make car to consume fuel

PJwise:
I have done that already. I have this scanner which I'm using to diagnose my car. The codes use to be, oxygen sensor bank 1, but I've replaced the two catalyst and service the sensors. That problem is gone. But the code remaining and refused to go after replacing the part is:
Idle air control valve. Read my initial post.
The thermostat has been removed and the code is there too but my mechanic said removal of thermostat can not make car to consume fuel

Replace the IACV or its assembly. I think there will be improvement.

PJwise:
I have done that already. I have this scanner which I'm using to diagnose my car. The codes use to be, oxygen sensor bank 1, but I've replaced the two catalyst and service the sensors. That problem is gone. But the code remaining and refused to go after replacing the part is:
Idle air control valve. Read my initial post.
The thermostat has been removed and the code is there too but my mechanic said removal of thermostat can not make car to consume fuel

Don't listen to that dumbhead mechanic with outdated knowledge.

Majority of them don't try to update their knowledge

PJwise:
I have done that already. I have this scanner which I'm using to diagnose my car. The codes use to be, oxygen sensor bank 1, but I've replaced the two catalyst and service the sensors. That problem is gone. But the code remaining and refused to go after replacing the part is:
Idle air control valve. Read my initial post.
The thermostat has been removed and the code is there too but my mechanic said removal of thermostat can not make car to consume fuel

don't be surprised that thermostat maybe the culprits,it is there for a reason,to warm the engine faster and maintain a good working temperature that reduced
S fuel consumption,cut and join mechanics and rewires.mad people

Did you later solved this?