How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Matt Your Own Question
Matt
Matt, Engineer - BEng Hons
Category: Porsche
Satisfied Customers: 20961
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
12772297
Type Your Porsche Question Here...
Matt is online now
A new question is answered every 9 seconds

My 2014 911 Carreras 4S yellow light came on and reads Fault

Customer Question

Hi, my name is***** 2014 911 Carreras 4S yellow light came on and reads Fault Engine Control possible to drive. Can this warning message be reset?
Submitted: 1 year ago.
Category: Porsche
Expert:  Matt replied 1 year ago.

hello

On any car if you get a check engine light or other fault light this typically means one or more of the sensors has failed or has afaulty connection.

The fault can be something quite simple and nothing that’s going to stop the car to something quite major that will reduce engine power and possibly stop the engine

The ECU senses this and may put the car into 'limp home' mode which typically limits the revs and the amount of power available. Usually the car is safe to drive for a short distance as the mode is intended is intended to get you home without incurring any engine damage

The quickest route to repair is to have the car plugged into a diagnostic machine which will read off the fault code stored in the ECU (providing the light is still on at this point) and indicate which sensor has failed or whether the fault is more serious.

You can do a very rough and ready check yourself by unplugging sensors one at a time and seeing if any of them change the driving condition which would indicate the mostrecently unplugged sensor is the faulty one. This method is not foolproof though and reading a fault code off is thebetter method.

You can also tryresetting the car by removing both battery leads and clamping them together for10 mins as this will reset everything so if the light re-appears then the fault is still there.

Disconnect the battery cables and clamp them together for 10 mins. Remove both battery leads from the battery then use a nut and bolt or G-clamp to hold both battery lead terminals together.

This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.