Q: My Mercury Mountaineer 2003 will not start.

asked by on December 26, 2016

I recently changed the spark plugs on my truck. Everything worked fine except for a shaking that the truck would do I went back and checked the spark plugs everything looked good. During the process I turned my truck on with one of the sensors unplugged. Now my truck has the check engine light on and will not start. I examined the codes that it gave me. They were P0102, C1440, and B1676. Are these sensors? If so are they what's causing my truck not to start?

My car has 170000 miles.
My car has an automatic transmission.

Car is not starting Inspection $79.99 - $89.99 Get a Quote

Hello, thank you for writing in. What sensor was unplugged when you started the vehicle? You will want to consider this sensor and the different systems that it may provide information to. Without that information the computer may have shut down the vehicle on purpose, or the engine may not have been able to run without it. The B1676 code is likely related to the battery power. It will trigger when the battery is not supplying power, or the ABS is having issues with its power supply. The C1440 code stands for a safety switch that relates to the ABS. This switch should not prevent the vehicle from starting but may be triggering as a result of the cause of the B1676 code. With that said, the issue may be fuse or sensor related. At this point either further electrical testing needs to be done, or the vehicle needs to be inspected by a technician. For more help diagnosing the issue, contact our service department to schedule an appointment.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Knock Sensor issue

The sensors are doing their job and telling you there is a knock in the engine. Even though it may seem like the sound went away, you may not be able to hear it when you drive but the sensors...

Vehicle won't start, once it's jump started it only stays running until you turn it off, then it work start again without jumping.

Hi there. There could be two problems here. It is possible that your battery is bad and will not take a charge from your alternator while driving. In that case every time you shut your car off you will not...

I have a 2005 Ford Mustang and it won't go past 20 miles per hr. There are no lights on sayings what should be checked and no nois

Hi there. Usually when the vehicle will not accelerate past 20 mph it is due to the ECU creating an error code that activates the "limp mode". This safety system is designed to reduce vehicle speed when an error is...

Starter? Battery connection? Something else?

Hi, thanks for writing in. Based on your situation, I would say your starter is fine, but your battery is bad. Cold Cranking Amps (CCAs) are what you use to start your car. They cannot be tested and they can't...

1988 Chevy C60 dump truck. Grinding noise from transmission while in gear

You might want to remove both PTOs first. They may be seized or have bad bearings. You may also have burned out the input bearings. The transmission will need to be removed and torn down to see what the damage...

Navigation system not working

The navigation system in your vehicle is a common failure. If this occurred right after a battery change then a code needs to be put in to get it going again. If the system is not turning on at all...

Recently replaced the TPS but still get code P0122, what causes this low voltage?

Code P0122 may also indicate that you may have loose or poor connectivity to the throttle position sensor itself or potentially not enough voltage being supplied from the ECM. I would recommend having an expert from YourMechanic come to your...

Truck won't start unless I remove the fuel pump relay

Hey there. This is a sign of a failing fuel pump or potentially a faulty power connection to the fuel pump. As you know, if the fuel pump fails to supply adequate fuel pressure to the motor, this will cause...

Tensioner Pulley Removal 2003 Dodge Neon

Hi - yes, it should be possible to only remove the serpentine belt idler pulley. After carefully releasing the tensioner, and removing the serpentine belt, there is a plastic cap at the center of the pulley. Pop this cap off,...

Related articles

The Most and Least Expensive Cars to Maintain
Luxury cars, such as BMWs, are the most expensive and Toyotas are the most cost efficient. Driving style also affects car maintenance costs.
Symptoms of a Bad or Failing Timing Belt
Common signs include a ticking noise coming from the engine, an engine that won't turn over, engine misfires, and oil leaking in front of the motor.
How to Start a Car in Cold Weather
Battery, oil, and fuel problems can make a car difficult to start in cold weather. Find out how to prevent starting issues related to weather.