2001 civic lx 4dr auto have a big problem my car is in limp mode and my obd 2 scanner wont link up but link up to my other 2001 civic can somebody point me in the right direction

 

If you cannot pull codes from the ECU, its more then likely the ECU that's gone bad.

 

Can i swap another 2001 civic ecu into this car without problems the car has autostart so the car got some kind of bypass for the chip key

And when the car is on it idle low like its goin to die intill the rpm on the cluster stop then idle better but still in limp mode

 

I don't know what type of aftermarket alarm you have, but I can assure you that you'll need to take the car in to a dealership just to match the immobilizer system up.

 

If the ECU is faulty and has to be replaced, the car will need to be taken to a dealership for them to reprogram the entire system including the imobilizer system. When you do this take all keys with you as that is a crucial step.

What happened to the car that lead to the issue you have?

 

I have no clue i just got the car like that i thought if i change some sensor and it will be fine

I have switched the tdc sensor and hope the car will drive fine but no luck

And the relay on the passenger side so now i guess imma switch ecu and hope it works

 

By chance has any of the battery cables been replaced?