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code p 0300 refers to random/multiple cylinder misfires detected==causes spark plug/s ---HT lead/s--injector/s--ignition coil/s-low compression --- wiring
it could be simple moisture in the distributor cap, wiring connections
It could be a problem ECM unit
monitor the condition or take it to an accredited service center that has experience on your make of vehicle and have it checked out
could be a problem that has already been identified and has a manufacturer service bulletin in place
It would depend on what sensor was coding and causing the engine light to come on. In most cases when the engine light turns off with out maintenance it means that the sensor that was sending the code ran long enough with out a problem that it reset. A lot of things that should be taken care of with your car can be affected by humidity, dusty air, barometric pressure, fuel additives, ect. I would still take it in to your mechanic and have them check the codes to see what the problem was. If you ignore some problems with your car they can cause bigger more expensive damage to occur.
When a 'check engine light' (MIL=Malfunction Indicator Lamp) is turned on, there is a DTC (Diagnostic Trouble Code) set/stored in the ECM/PCM (Engine Control Module/Powertrain Control Module). This code identifies which engine management system component/function experienced a malfunction. Once you pull/read this code, you may begin diagnosis. I think you'll find P1529 (MIL On request from the TCM - Transmission Control Module.
First of all you need to access the Engine Control Module (ECM) using suitable diagnostic equipment (VAS, VAG-Com, or similar) connected to the data link connector of the car, in order to pull out all DTC's memored. DTC = Diagnostic Trouble Code. Then you will bu full informed about the root cause of the problem, and you will be able to repair & replace bad pieces and reset the ECM. Then the check engine yellow light will turn OFF. The check engine light (MIL = Malfunction Indicator Lamp):
Let me know please about found DTC's. I will assist you kindly to fix the problem.
Check for battery to motor ground and battery to body ground for corrosion under mounting bolts. also check motor to body ground strap for corossion and overall condition. Bad ground can cause all sorts of problems. Also check all electrical connectors to glow plugs for corossion.
YOU ARE GETTING A SERVICE CODE SOMETIMES YOU GET A PROBLEM UNDER CIRITION CONDITIONS THAT MAKES THE MIL LIGHT COME WHEN THE CONDITION GOES AWAY THE LIGHT WILL GO OUT AND SYSTEM RESETS YOU REALY TO FIND OUT WHAT THIS CODE IS TRY TAKEING IT ON AUTO PARTS STORE MENY OF THEM WILL PLUG A CODE SENSOR AND READ IT FOR YOU FOR FREE BUT MAY NOT A CODE UNLESS THE LIGHT IS ON ITS PROBELY NOT A MAJOR PROBELM BUT SMALL PROBLEMS LEAD TO BIG PROBLEMS DOWN THE LINE GOOD LUCK
Hi, the MIL (engine check light) will only go out when the car has had 50 drive cycles - start, run to normal operating temperature and stop, without further faults. A normal EOBD code reader such as you used to check for the fault originally should also be able to cancel the fault and put the light out. If the code won't clear, suspect a faulty ignition coil. Which is a common fault on these vehicles.
Hope that helps Matt...