List Of 2007 Volvo S-40 Has Flashing Check Engine Light Ideas. Problem with exhaust gas oxygen sensor (lambda probe): In just about every instance i've seen, the dealer has replaced the egr valve (and cooler in some cases) and it's resolved.
And i would take it back to the dealer who sold it to you, they just erased the code to sell the car, most likely it was already there. If you notice that your check engine light is always on, take your in vehicle in for service and request that they check the engine control unit. I also get a code for faulty software signal, but that because of the tune , so the flash is there to stay.
