Returning computer settings default

Question edited for clarity, spelling of maker, toss in some CAPS
Question moved to maker category.

" overheated due to welch plus failure. "?? What??

When it goes into Limp Mode the ECM will throw codes telling you why you are in Limp Mode. From the code you get the fix.

An auto electrician with a professional grade scan tool computer can look at historical codes. Limp Mode is very serious and is activated to stop catastrophic engine failure.

https://www.google.com/search?q=mobile+auto+electrician+near+me

https://www.google.com/search?q=overheated+due+to+welch+plus+failure

..

A professional grade scan tool will tell you the reason by way of Diagnostic Trouble Codes

https://www.google.com/search?q=auto+electrician+near+me

..

Replacing accelerator cable and gearbox cables would have no bearing on this, and replacing the fuel pump and injectors likely not going to help. Is the vehicle overheating? That is the place to start as overheating can cause Limp Mode.

Or you find a local auto electrician to connect a professional grade scan tool computer to check for Diagnostic Trouble Codes and historical data. It sounds like the dealership don't have a clue. A pro scan tool can record what happens when it goes into limp mode.

Make sure there is no air in the cooling system

https://www.fixya.com/cars/r29872074-vehicle_cooling_system_no_heat

https://www.google.com/search?q=2018+hyundai+h100+limp+mode+problems

https://www.google.com/search?q=auto+electrician+near+me

..

2005 year, BMW (secret) 325i, engine , inline 6cyl. the E46, engine type. M54B22 2.17liters.????
the USA engine or Europe or what?
NO country told wow that is a hard nut question.
get it serviced in a real shop ! end.
no real evidence told, only
what means limp, ASE defined, USA>? or you speak that in some untold why ,what does limp mean to you.
ASE defines that is what you get in EFI PCM limphome mode. or CEL lamp stuck on.

and...
limp home, happens on many things in car.
ECU/PCM limp for engine , failures DTC gross errors, why not scan the PCm first.? SCAN it with real BMW scan tool to see all BMW codes (DTC)
transmission limp mode. happen too, again scan it.
if in use the scan tool OBD2 fits to the 16pin USA scan port called DLC. and a good tool sees all P0xxx codes and P1xxx p2 ,p3 up BMW factory codes. DTC, using the wrong tool is working blind
no modern car can be fixed now lacking a tool of such kind
drive line, airbags, ABS, and more. lots more.
NO RPM told hot and cold engine, and parked or driven, that is huge clue that
is the thermostat stuck open?> not a 180f to 200f coolant scanned.

voltage goes down? if battery voltage on 800rpm HOT running engine
falls below 13.3vdc the alternator is failing
13.3 to 14.7 is par, running, below never.
key off is 12.6v SOC 100% fully charged.


Limp on the engine, PCM , means gross engine control errors
of senors or actuators or even a bad engine.
and all set DTC errors you forgot to do that. scan it first.
Check engine lamp glows running is the 1st clue
A.K.a. CEL, SES OR MIL LAMP.

there are lots of symptoms not told and good and bad both matter !!
and no tests done at all. parts replaced sure.
tell more evidence. or do the tests. both.

Why would you just buy a used computer instead of reading the codes with a scan tool and fixing the issues that put it into Limp Mode. It is often something as simple as replacing a $18 sensor. Your ECU needs programming with VIN Number and the mileage so you need an auto-electrician anyway.

Rough idle is probably a throttle body and MAF that needs cleaning or they may have failed. It may also be the Throttle Position Sensor. Limp Mode keeps you in first and 3,000 rpm. Limp Mode only saves you from damaging the engine. Get it on a pro grade scan tool computer in a repair shop.

all in the link

https://www.google.com/search?q=2006+ford+five+hundred+limp+mode

..

Use a scan tool to find trouble codes that are causing the CEL to come on and address issues found.

Since you fixed the fault by scan advice and was ok and on testdrive another limp mode came up, just check again with your scan to see what is the possible cause for it. Probably the crank sensor.

try using a scan tool to reset the computer

You need to have the codes scanned to determine what has failed. The light will continue to come on as long as the computer detects a problem and will put the vehicle in limp mode

verify the code with a different scan tool,
if it is going in limp mode it should be a trans code