Question about 2005 Peugeot 405

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Hello, The ecu on my car has packed in again. so was wondering if i brought another ecu from same sort off car will it work? or does it need to be recoded to the car

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Same car ecu should work. Provided exact same engine and part. You can check the part number against them. Think there supplied by bosch for this car.

Posted on May 17, 2009

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i've had similar issues with a 1999 M3. normally attributed to electrical power levels this could be a low voltage issue.

do you have error codes?

make sure the power contact at the starter motor (between the alternator and the battery) is tightened.

I have also had issues with a cranshaft position sensor. but my favourite culprit of electrical issues is a wet ECU.

the ecu compartment is under the windshield on the passenger side on E36

you gain acess to it under the hood....
this compartment gets wet, the ecu lays on a flat surface in that
compartment.

the bottom side of the circuit board gets wet and starts corrosion.

remove the ecu, take the bottom plate off, clean the bottom of the circuit
board with alcohol and a soft tooth brush.

you should be able to see the signs of corrosion or conductive build up.

this gunk bridges solder points doing all sort s of wierd things to your
car, including false sensor readings from asc/abs controllers and other
sensors....

all the way to engine failure and worst case burnt and shorted wiring
harness.

I'm on my 3rd ecu, took me and the repair boys a few years to figure this
one out.

BTW: i would get that ecu mounted above that flat surface, use some sort
of standoff to raise it so that it is not laying in the wet.

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1 Answer

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low power, bmw ecu has some code that starts shutting down systems on low power. so poor charging from the alternator to the battery.

this could also be a wet ecu tracking false codes.
i don't have direct experience with a series 5 but also check your ecu condition.

the ecu compartment is under the windshield on the passenger side on E36

you gain acess to it under the hood....
this compartment gets wet, the ecu lays on a flat surface in that
compartment.

the bottom side of the circuit board gets wet and starts corrosion.

remove the ecu, take the bottom plate off, clean the bottom of the circuit
board with alcohol and a soft tooth brush.

you should be able to see the signs of corrosion or conductive build up.

this gunk bridges solder points doing all sort s of wierd things to your
car, including false sensor readings from asc/abs controllers and other
sensors....

all the way to engine failure and worst case burnt and shorted wiring
harness.

I'm on my 3rd ecu, took me and the repair boys a few years to figure this
one out.

BTW: i would get that ecu mounted above that flat surface, use some sort
of standoff to raise it so that it is not laying in the wet.

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1996 BMW 740il while trying to pass on the highway the car started slowing down when I pressed on the gas. A while later it started slowing down completely. I had to stop the car rest then start again. I...


wet ecu....

read the note below about E36

the ecu compartment is under the windshield on the passenger side on E36

you gain acess to it under the hood....
this compartment gets wet, the ecu lays on a flat surface in that
compartment.

the bottom side of the circuit board gets wet and starts corrosion.

remove the ecu, take the bottom plate off, clean the bottom of the circuit
board with alcohol and a soft tooth brush.

you should be able to see the signs of corrosion or conductive build up.

this gunk bridges solder points doing all sort s of wierd things to your
car, including false sensor readings from asc/abs controllers and other
sensors....

all the way to engine failure and worst case burnt and shorted wiring
harness.

I'm on my 3rd ecu, took me and the repair boys a few years to figure this
one out.

BTW: i would get that ecu mounted above that flat surface, use some sort
of standoff to raise it so that it is not laying in the wet.

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