Q: Camshaft position sensor keep failing after i replace it. after 2 miles the check engine comes back on for that sensor 2003 BMW 745Li

asked by on January 25, 2017

camshaft positon sensor keeps failing after i replace it

My car has 70000 miles.
My car has an automatic transmission.

Loss of power Inspection $79.99 - $89.99 Get a Quote

Hello - you don’t mention the specific problem codes you are getting, but the problem you are having may not be the cam sensor itself. Rather, the problem could be the "v-shaped" timing chain guide between the cylinder banks. This engine is notorious for wear on this guide, which changes cam timing for Bank 2 (passenger side) of the engine, and causes a variety of cam timing problem codes. I recommend a loss of power inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, confirm this diagnosis, and give you an accurate assessment of damage and cost estimate for repairs.

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

Driver's headlight out

You most likely need a bulb replaced, however, I recommend replacing both bulbs for the left and right side so they burn at the same brightness, and the other side does not burn out shortly soon after. I recommend seeking...

Water leak in my rear passenger foot well

There may be no easy answer for this. Modern cars are so thoroughly insulated and sealed, and the interior structures are so complex that it can be very difficult to find the kind of leak that you're looking for. It...

Heater blows cold air

Hello. If the A/C won’t blow cold air, this is usually due to: Lack of refrigerant in the A/C system A/C compressor has stopped working Blockage in the A/C system It will first be necessary to...

My heat and AC do not work - 2003 Volkswagen Beetle

It sounds like the blend door may be stuck. The blend door is usually controlled by a cable or an actuator. If the switch itself seems to be hard to turn, it is likely cable driven and experiencing a restriction....

My park 2003 Cadillac Escalade was hit on the front driver side knock a foot from where it was parked and back up on the center is.

Due to the collusion on the vehicle, the exhaust system was damaged and causing excessive air to get into the exhaust before the oxygen sensors. If the engine light was not on before the accident and now it is on,...

Speedometer fluctuating

Hi There, This could be related to a couple of possibilities. The [instrument voltage regulator]((https://www.yourmechanic.com/services/instrument-voltage-regulator-replacement) regulates the voltage supplied to the various gauges in your vehicle’s dash. When this is not working properly, this may cause the gauges in your...

Hunting idle speed and stalling.

Hi There, It sounds like you may have an issue with your evaporative emissions control system causing the hunting idle problem and the no start issue after filling up your fuel tank. Your car has a small purge valve called...

my trans malfunction warning light came on and 1st and second gear is slow. what can i do

When a module illuminates a warning light, generally there is a fault code that accompanies it. there can be many reasons for the concern like a low fluid level or a failing internal transmission component. Fluid leaks are common as...

Revs low when idle and falls when at traffic lights

Hey there. Even though you've cleaned the idle air control valve, that doesn't guarantee that the valve isn't still sticking or otherwise malfunctioning. You could try very gently tapping on the valve and see if that affects engine speed. The...

Related articles

What Sensors Do All Cars Have? And What Optional Ones Are There?
Modern cars have an increasing amount of sensors. Most cars have an oxygen sensor and a throttle position sensor, but parking sensors are optional.
Can a Bad Sensor Prevent a Car From Starting?
If your car isn't starting or has a hard time starting, a faulty sensor may be to blame. Car sensors monitor data to keep your car running smoothly.
Can a Bad Sensor Prevent a Car From Starting?
If your car isn't starting or has a hard time starting, a faulty sensor may be to blame. Car sensors monitor data to keep your car running smoothly.