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.

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

Need to start my car after sitting for a year.

The recommendations for putting the car back into service is to remove and replace the old fuel in the fuel tank. Replace the fuel filter. Charge and test the battery and replace if needed. Change the oil and filter after...

Engine won't crank

Hi. There can by many reasons why the engine is not cranking, the first thing I would check is to make sure that the battery is charged and in good working order. Many times a vehicle will not crank simply...

2003 Chrysler pt cruiser's steering wheel is extremely hard to turn. Checked fluid and it was good. What should i do?

Possibilities include low pump output, a poorly drive pump due to a faulty drive belt, a binding rack and pinion unit, restrictions in the pressure lines, and binding in the steering linkages. The only way to diagnose the pump is...

Car died when driving after it struggled to accelerate.

Hi Carlos. Thanks for contacting us. There are a few things that might be causing these type of starting and engine running problems. The first and most obvious would be that the engine is not getting either enough fuel -...

I'm looking at a car for my son. It's an awesome little car in excellent condition. Is this a bad idea for use as a daily driver? 2003 VW Jetta 1.8 T

Hello - awesome little car indeed! Despite the usual caveat of high-performance cars for (relatively) new drivers, a small sedan like this is a great choice. The usual cautions about taking care of turbocharged engines apply here - always use...

What's a camshaft sensor do?

The camshaft position sensor reads a reluctor wheel on the camshaft and determines the location of the firing sequence from cylinder 1 to cylinder 6. The camshaft position sensor works in relation with the crankshaft position sensor to allow the...

Auto climate control

Even without having specified what model Mercedes, yes they do use in car temperature sensors. Your issue can be related to the in-car temperature sensor or the climate control unit itself. Since Mercedes climate control systems are known for their...

Air intake noise

This metal scraping noise may be inherent to the metal tube. The original tube was designed to be quiet and not be noisey when opening throttle. The noise is from air flow disruption through the air tube. The metal tubes...

Squeaking noise when braking. Pads still very good.

The majority of modern cars on the road have certain wear marks in the brake pads that will make a squeaking noise when they reach a specific material thickness. When the pads wear down to a specific mark, they will...

Related articles

How Much Does the AC Affect Fuel Mileage
Your car’s air conditioner is an important accessory – it helps keep you and your passengers comfortable and...
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.
Symptoms of a Bad or Failing EGR Temperature Sensor
Common signs include engine ping or knock, the Check Engine Light coming on, and failing an emissions test.