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It can be one of two problems. One: pending on what kind of car you have. ..there is a switch near the steering column that turns left or right...adjusting your dash lights and or turning on/you interior lights.#2...check the interior fuse bus panel/box
the ecu controls the power to the pump and injectors. are you getting error on every test on reader that can be the ignition relay. its in the dash when you turn the key should hear it go click click. if just one click then one side of it has gone. there is the low volt side, ignition interior dash lights etc. high volts is ecu abs, air bags. etc. low volts go to the abs and ecu but when engine started it needs the high volts to be there to run.
Yes, it could be the cylinder head gasket. That should probably be the first thing you should have checked. If it overheated bad enough, it can also warp the head necessitating machine shop work to true it up again.
there are 2 connections on the bulkhead/firewall.
There is one on each side.The connectors are brass and the insulators
are plastic with a rubber boot. unless these connections are clean you may get all sorts of malfunctions
with switches,lights and electric
motors. Symptoms are similar to a
failing battery, something to start with..
The button or the fob will not work with low or no battery power - you need to use the key. There is a keyhole on the boot under the trim or under by the reg. plate lights according to what facelift model you have.
Sounds like carbon build up on the contacts inside the electrical ignition switch which is not the key cylinder. Its located on the lower steering coluum if coluum shift or if you have a floor shift it will be inside the console
jump start vehicle with commercial grade leads and see what happens,,might just need a new battery sounds like its low and has no reserve amperage although a volt check will show ok,or test it with a proper discharge gauge to see if a cell has packed up.