Skip the auto shop - Our mechanics make house calls

Q: Displacement on demand not working.

asked by on

Check engine light appeared. My obd reader says to check oil pressure switch. I cleared the engine light and now the displacement on demand will not go from 8 to 4 cylinders . Could this be a faulty switch? The oil level is ok. Thanks-Joe

My car has 65000 miles.
My car has an automatic transmission.

The 8 to 4 system will automatically default to 8 cylinders if there is any problem that the ECM determines through its programming that it should disable the system. If you are having problems with the oil pressure sensor, it may be the cause of the problem. The Check Engine Light is a good indicator of where the problem may be occurring. I recommend having a certified mechanic, such as one from YourMechanic, come to your car’s location to diagnose the Check Engine Light and make the necessary repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Displacement on demand not working.

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

Q: What is the average cost for a valve and piston rod replacement job. I thought it was the lifter but now they say its valve.

The cost depends on the amount of damage and is quite literally impossible to even guess at without physically removing the parts and determing exactly what parts have to be replaced. It is not just a simple matter of taking...

Q: How do you know if you just need the bearings repacked or the entire assembly replaced?

In order to know if there is additional hub damage then you will need to disassemble the hub and inspect bearings and races. If bearings are bad then it may damage the hub.

Q: My oil pressure sending unit is faulty. What is the cost to replace it?

The cost of replacing your oil pressure sensor will depend on what year and model your Ford is and sometimes the engine type as well. But you should know that oil pressure can be low even with plenty of oil...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...