Engine control modules replaced on a newer car

ANSWER : Hi there. These modules are common failures on the Jaguar XF. I am sure that this does not make you feel any better about it, but from my experience, once the modules are replaced you usually do not have any further issues, assuming that new factory modules were used. Many times these modules fail due to voltage issues in the electrical system, so it is important to always make sure that the battery and alternator are good and that all do the ground connections are clean and tight. Your car should be fine for now, but if it begins to have drivability issues, you may want to start looking to sell the car.

ANSWER : The P0700 trouble code is a code for transmission control module (TCM) failure. Without knowing the other codes, it will not be possible to give you an accurate answer; it all depends on the other codes:

If you get a P0755 code, you may have a transmission solenoid pack issue.
P0725 indicates a likely crank position sensor issue.

I would suggest having your Check Engine Light diagnosed by a qualified mechanic.

ANSWER : If a used engine was installed, to make a wise decision you would need to know exactly how many miles were accumulated on that used engine PRIOR to its transplant to the car that you are looking at. However, if a "new" engine was installed, then you might have the opposite of a red flag which is a good deal but even that depends on whether the "new" engine was actually properly installed according to the instructions. The only real "red flags" in a car purchase are collision damage (whether such damage is repaired or not stay away), rust, abuse, and lack of maintenance. Consequently, the mere fact that a "part", even a part as big as "the engine", was replaced is not important. What is important is whether the part was PROPERLY installed and, in your particular circumstance, if the part was "used", exactly how many miles were on it prior to installation in the present car? And, of course, is the engine presently functioning well (it can be tested and evaluated, to some extent, during an inspection).

With regard to any used car purchase, you want to confirm that the vehicle has NEVER been in a collision (Carfax might be helpful) and that the vehicle does not have any outstanding recall-related repairs. Apart from that, inasmuch as used car repair, maintenance, and restoration costs are highly dependent on the actual, as found, condition of the vehicle, the only way to get a reasonably precise estimate of costs you might face, and also to protect yourself in the transaction, is to request a pre-purchase vehicle inspection. That inspection, carried out by a certified Mechanic, dispatched to your location, will give you the exact data you need to make an intelligent, informed decision about any car. If you look at the just cited link for YourMechanic’s inspection service, you will see a long list of the vehicle systems that must be inspected as well as details of YourMechanic’s inspection methodology. If you need further help, please do not hesitate for a moment to re-contact YourMechanic and we will assist you further in your attempts to make a wise used vehicle purchase.

ANSWER : If you swapped the engine from a vehicle that is 4 years newer than the car is then you are going to have electrical and sensor incompatibilities that may not be able to be fixed by just a few sensor replacements. There were many changes in computer and emission related items between 2010 and 2014 engines. I would recommend having a mechanic like one from YourMechanic come to you and compare the two engines to isolate the possible differences and see if the problem can be fixed.

ANSWER : Hi there – the most straightforward way to replace (and even upgrade!) your existing engine, is to simply purchase and install a "crate" engine from GM. These are new motors, with a warranty serviced by any GM dealer, which come in an astound number of configurations, from stock, period-correct bolt in replacements, to high performance replacements for increased power. Let your checkbook be your guide. Crate engines are available, to your door, from after market suppliers like Jegs and Summit Racing. Your neighborhood service center or mechanic can then install it for you, and you’re back on the road! Unfortunately, this is not a service YourMechanic offers at this time. Thanks for thinking of us though!

ANSWER : Hi there. If there is carbon build up on the valves in the engine then that can cause a rough running condition and even a check engine light but that will not usually cause the vehicle to stall. It sounds like you have another issue going on here. From my experience with this vehicle most of the time this is caused by a voltage issue. Most of the time it is a loose or dirty ground connection or an issue with the ignition switch. I usually start by scanning the computer for codes to see what is coming up as that can assist in finding the issue. If the codes do not help then the electrical system would need to be diagnosed to see where the power is being lost. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the check engine light is on and why the vehicle is stalling] https://www.yourmechanic.com/services/car-is-stalling-inspection

ANSWER : Hello there, you have a long series of issues going on with your 2013 Hyundai Sonata. If you keep getting a repeating oil light on than there is likely a fault in that system.

Since this fault has lasted after the engine was replaced it could be a oil pressure sensor, wiring harness fault, ECU fault, oil pump, oil strainer clogged, or low oil pressure.

To diagnose this issue properly you need a complete vehicle inspection to start from square one and identify the root cause of all this.

ANSWER : Hello. It sounds like you may have an issue with your throttle position sensor. This sensor sends a reference voltage to your power-train control module, which uses that to determine ignition timing and fuel trims. If the power-train control module is not detecting the proper signal from the throttle position sensor, the engine may not accelerate properly. It’s probably a good idea for you to have a professional mobile mechanic come to your location and complete a car is slow to accelerate inspection first, so they can pinpoint what is causing this issue to occur and they will recommend the right repairs be completed.