There's little doubt that cars today are more reliable than their predecessors. They're more communicative, too, letting you know early on that there's a developing issue, whereas old cars just let you know by making bad noises and generating clouds of smoke. Now, a car can tell you pretty much what's ailing it through a warning light and a fault-code reader. Click here to see our test of the best fault-code readers you can buy.
Here, we explain what some of the most common fault codes mean.
P0116
The P0116 code is a warning that there is an issue with your car's engine coolant temperature sensor or circuit. This means that the engine’s electronic control unit (ECU) isn't getting a clear reading of the temperature of the coolant, making it difficult for it to adjust the air/fuel mixture in your engine.
What are the symptoms of the P0116 code?
The most common symptom is an illuminated Engine Management Light (EML). You may also experience a decrease in fuel economy, as the ECU will be unable to optimise your car’s performance. If the code is ignored for too long, other components in your engine may suffer damage due to incorrect temperature readings.
What causes the P0116 code?
The most common cause of the P0116 code is a fault in the wiring, or a faulty coolant temperature sensor. Other causes can include issues with your car's thermostat, radiator fan, and cooling system components. It's also possible that there may be an issue with the ECU itself.
Can you drive with a P0116 code?
Yes. The P0116 code is not usually an emergency situation and you won't be left stranded. However, it's important to get it fixed as soon as possible to avoid further damage and deterioration of the vehicle's fuel economy.
How to diagnose a P0116 fault code
A diagnostic tool is the best way to diagnose a P0116 fault code. This will allow you to read the code and access other data from the car's ECU that can help you pinpoint the problem. Once you have identified the issue, you can then begin to rectify it with the appropriate repair steps. And that's when you can consult your vehicle's Haynes manual or Autofix, because these products will tell you how to go about replacing the affected components.
How to fix the P0116 code
The most common fix for a P0116 code is to replace the engine coolant temperature sensor. This should be fairly straightforward and inexpensive. You may also need to check the wiring for any faults, or replace other components depending on your diagnosis.
