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Re: ecu unit .
Yes&Yes, had a similar prob. with a 02` Waxhaul Vectra here, had to order an USED ECU through Waxhaul with install. and antitheft- codes(several!)
And get an licenced dealer to install it...wasnt cheap sorry...;(
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replace the ECU ( ECM ) with another unit
you will need to get one from another exact same vehicle and there should not be any other problems other than the immobilizer which you can get reprogrammed or have the keys reprogrammed to the ECM
The unit getting hot and draining the battery indicates that it has failed and has to be replaced
Wreckers / junk yards that dismantle your make of vehicle will have comparable units st a reasonable price ( probably an arm but you will keep your leg)
or there are companies that can recondition your existing unit or sell you an service exchange unit for around 2/3 the price of a new genuine unit
ECU (engine control unit), ECM (engine control module), PCM (power train control module) VCM(vehicle control module). Basically your vehicle's computer. There are independent shops with the hability and the technology to reprogram it but for sure your manufacturer's dealer.
Some ignition systems need a control unit that picks up on, Engine, ignition key and ECU's in paticular vehicles to prevent theft without coded keys. you may need your ignition and / or car recoding..
For recode the steering angle sensor you must connect a diagnosis scantool to the data link connector of the car in order to access the ESP ECU (Electronic Control Unit), in other words programm again the steering angle sensor in the ESP ECU. Select the steering angle sensor programming (learning) menu, and follow the steps: put steering wheel in straight direction, then turn steering wheel to the left direction less 15 degrees, then to the right direction less 15 degrees, put steering wheel in straight direction again until the programming was done. Then the ESP light will turns OFF.