Popular questions

The variable valve timing VANOS system on your car can become sticky over time. Particularly if you are not changing the oil diligently. It is a hydraulically operated device that advances the camshaft using engine oil pressure under certain conditions....

The downstream oxygen sensor is screwed into a "bung" on the rear of the catalytic converter assembly beneath the vehicle. The sensor should be readily visible as it will have wiring connected to it. The sensor should not be removed...

Hello. This may be a sign of a failing throttle position sensor. The throttle position sensor is a sensor used to monitor the throttle position of the throttle plate inside the throttle body in relation to your foot position on...

I'm assuming you're talking about the fuel pressure regulator. If the regulator is not leaking, the only test for it's functionality is a fuel pressure test. That takes some special equipment. If the car is backfiring out of the intake,...

Hi, thanks for writing in. The best way to get a wiring diagram for your vehicle is to use a Chilton book, a factory service manual for the particular wiring diagram that you are looking for. As far as instructions...

Brake fluid leak sources are quite varied and can be traced to tubing perforation due to corrosion, bleeder screw leaks, internal master cylinder leaks, and seal leaks. Any leak of brake fluid is serious and so I recommend that you...

Engine knocks can mean serious business, and at 220 thousand miles it could be just about anything. It could be that you have internal engine damage. Before you drive the car any more, you should have t checked out to...

This may be related to a dirty or faulty idle air control valve. This is a unit that reads the air intake at low or idle speeds and relays this information to the computer which then makes adjustments to fueling....

The vehicle may be having a problem with the A/C relay staying engaged after you shut off the vehicle. Try and make sure the A/C is off and the compressor is not engaged after you shut off your vehicle to...

Hello there. Random electrical faults such as this are usually pretty rare. With this many faults and systems affected, it points to only a few possible causes. The most likely would be a body control module, wiring short, or a...

The frame and/or suspension components have been damaged. To determine which will require some measurements and inspection. If all the damage is suspension related, that is assuming none of the sub-frame is damaged or the suspension mounting bosses, it is...

There is no code P07444 and only P0704 for this vehicle. The code is for a shift solenoid malfunction in the transmission and will need to have the transmission serviced to test the circuit to see if the solenoid is...

Hi there, thanks for writing in. Sounds like this may be related to either transmission components failing, or potentially a fuel delivery problem which may also create the jerking feeling that you're describing. Does the car run fine when in...

When you are driving on the highway above 45 mph your engine cooling fan does not provide any flow and the car relies on the force of moving air from the speed. The fan can still come on if needed...

Hi, thanks for writing in. Let me start by explaining one of the strong possibilities concerning the misfiring. When the EGR valve malfunctions, the engine cylinders can combust prematurely. The computer will then detect the issue and label it as...

Hey there. This may suggest a short or potentially a bad fuse or relay problem related to your AC. Your car's computer has what is known as a "fail safe" default that is engaged when the computer detects an electrical...

Cranking and turning over are essentially the same, so I will assume that it cranks but won't start. There are many variables that go into diagnosing a no-start condition. The fuel pump is just one of many things that can...

There are several issues that could cause your A4 to nearly stall as you slow down. Most of the time, it's caused by an idle control valve that is damaged or dirty; however, vacuum leaks could also cause rough idle...

It sounds like you blew a head gasket or broke the timing belt. Over revving the engine in second gear may have caused the timing belt to break. It will not start and this is an interference engine that bends...

Hello. First task is to extract any problem codes, whether the Check Engine is set or not. There are many things that can cause the symptoms you describe: injectors stuck open, or fuel pressure too high, coolant temperature sensor malfunctioning...

Your car comes standard with a tire pressure monitoring system (TPMS). This system is responsible for monitoring the pressure in all four tires (but not the spare). If it detects low pressure, the Low Tire Pressure Light on the dash...

The rotors and pads should be replaced as a set. If not, then you will not have even wear and diminished brake stopping power until the two components are seated to one another. Sometimes cutting a rotor will not...

Relays provide for managed power distribution. A chattering relay is a failure mode where the electrical contacts are burned and aren't delivering power. I would have a professional mechanic identify which relay is chattering and determine how relevant that relay...