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 Gaz Robinson Your Own Question
Gaz Robinson
Gaz Robinson, Auto mechanic and MOT Tester
Category: Car
Satisfied Customers: 735
Experience:  18 years knowledge of the MOT test and general automotive skills.
Type Your Car Question Here...
Gaz Robinson is online now
A new question is answered every 9 seconds

Glow plug light flashing whilss engine running

Resolved Question:

glow plug light flashing whilss engine running
Submitted: 6 years ago.
Category: Car
Expert:  Gaz Robinson replied 6 years ago.



Thank you very much for your question.


The glow plug warning light will flash or illuminate when the engine management unit (ECU) detects a fault. This fault will have been stored in the ECU's memory and can be retrieved using a suitable code reader. When the light is on or flashing, the engine may be put into a safety mode to prevent any possible damage occurring, if this happens, you might feel a drop in performance.


You will need to have a diagnostic check carried out to determine exactly what the fault is.


Most garages are equipped to carry out this check nowadays, so I would suggest phoning around for a quote unless you use a garage regularly. You do not have to go to a main dealer. The most common faults are faulty cam or crank sensors, but many other things can cause the light to flash, so guessing isn't really a viable option and will certainly cost you money.


Continuing to drive your car should not be a problem if you take it easy. However my recommendation would be to have a diagnostic check carried out as soon as possible, just in case.


I hope this answers your question.


Regards, Gary.


Gaz Robinson and 9 other Car Specialists are ready to help you