Q: why does my 2006 F150 5.4ltr 4x4 studder while trying to downshift ?

I would check and see if the brake lights are working. If the car will not shift out of Park and the brake lights do not work, this usually means that the brake interlock switch is faulty, and needs to...

Hi, thanks for writing in. I'd be happy to help. An ABS fault will not effect engine performance. It will however, effect the anti-lock portion of your brakes. Your brakes will function like normal brakes except in slippery conditions or...

Hi, thanks for writing in. The cruise control uses some of the same sensor inputs the transmission uses and can indeed affect the transmission and cruise control. If the transmission is slipping then the cruise control may not control the...

I would first check to see if your Check Engine Light is illuminated. If so, there are likely trouble codes that have been stored in your vehicle's PCM that may indicate what the problem is. In order to pull these...

Hey there. This may suggest that the coolant fan relay switch (https://www.yourmechanic.com/services/thermo-coolant-fan-switch-replacement) may not be working properly. When you car is moving down the freeway at higher speeds, the engine gets a lot of cooling assistance just simply from the...

Hello. If the battery voltage reads low on the gauge then that is a sign that the charging system is not functioning correctly. If the alternator is brand new then there is little chance that it is the source of...

Hello - you have multiple, unrelated problems here. The Vehicle Stability Assist (https://www.yourmechanic.com/question/what-is-the-vehicle-stability-assist) (VSA) system may only have a problem with a wheel speed sensor, a common problem with electronic stability and anti-skid brake systems. The emissions and "burning smell"...

Hello: P0430 is a generic diagnostic trouble code (https://www.yourmechanic.com/article/p0430-obd-ii-trouble-code-catalyst-system-efficiency-below-threshold-bank-2-by-spencer-clayton) that indicates a malfunction within the catalyst system. It may been seen with misfire codes and oxygen sensor codes. Before you get a quote for replacing the catalytic converter, you may...

Hi there. You might find this article very helpful (https://www.yourmechanic.com/article/p2138-obd-ii-trouble-code-throttle-pedal-position-sensor-switch-d-e-voltage-correlation-by-andrew-quinn) in trying to diagnose the root source of this error code. The article will also explain what the code means, common causes and repairs.