Q: Does camshaft position sensor affect in any way the fuel consumption?! 2003 Mercedes ML350

asked by on December 28, 2016

replaced cam sensor and it seems that rpm are a bit higher than before at cruising speed.

My car has 95000 miles.
My car has an automatic transmission.

Hello - yes, a failed camshaft sensor can negatively affect fuel economy. With a failed cam sensor, engine management reverts to a "fail safe" engine timing scheme which is less efficient than when all sensors are working properly. The symptom you describe however - "RPMs seem higher at cruising speed" should NOT be related to the cam sensor. Perhaps you have accidentally invoked "Sport" mode, which may not include torque converter lockup, or select Overdrive? Doing so would have the effect you believe you are noticing.

Was this answer helpful?
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

Get a quote

What others are asking

Car starts, then won't restart, then starts again

Hi thanks for the question, problems like this can be as hard to diagnose as they are to live with. It sounds like you may have some intermittent electrical issue. This will require a skilled technician that has the knowhow...

Hi Jose

There are two camshaft position sensors on your vehicle, designated "left" and "right". In addition, there is a crankshaft position sensor. YourMechanic offers diagnostic and replacement services for these sensors. In the case of the camshaft position sensor, request CPS...

Transmission problem?

This kind of reaction is often a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer...

Related articles

Symptoms of a Bad or Failing Manifold Temperature Sensor
Common signs include a rough idle, lack of power, high NOx production, and emissions test failure.
How Do Rain-Sensing Wipers Work?
Several Several decades ago, the only settings windshield wipers came with were low, high, and off. Later, an intermittent wiper feature was integrated into many windshield wiper switches, allowing drivers to reduce the frequency of wiper movements based on the...
What Sensors Make the ABS Work?
When When we are discussing ABS systems it is good to note the year and make of your vehicle because ABS systems have evolved quite a bit over the years, but you also have to know how the ABS system...