I cannot find any information on what the EML light does. The manual states " The engine electronics are malfunctioning", so my question is what engine electronics report back to the ECU that they are malfunctioning.
I think the following engine electronics would send information the the ECU to light up the EML since it handles the operation of the engine.

1) Knock Sensor
2) MAP or TMAP sensor
3) Cam position sensor
4) Crank position sensor
5) Temperature Sensor
6) Oil Pressure Sensor
7) Throttle Position Sensor

I think that the SERVICE ENGINE SOON lights up when an emission problem is detected. Also I cannot verify if there is a relationship between the SERVICE ENGINE SOON light and EML light. I can have one of the lights come on or the other light come on or both come on and when I check the codes it dose not show any malfunctioning engine electronics. I cannot chase the cause of the two codes I am getting (P1498 & P2098) both of these codes are emissions related. i have replace the IC boots, all of the vacuum lines. The exhaust manifold, the plastic inlet tube that is suppose to crack and i still have the codes. I can erase the P1498 and it may stay off for hours or days and seems to happen when the engine is warming up or just after a start up. related. The P2098 is a hard code and I cannot remove it and it will not go away after months of throwing parts at the problem. i cannot fix what I don't know, so I am hoping someone here can help me to get an answer.

 

This is what I have found:

1. Clearing the code and repairing the exhaust leak.
2. Replacing the pre catalyst O2 sensor or repair the wiring.
3. Replace O2 sensors for the pre and post catalyst if they are damaged from an issue that has got repaired like a head gasket that leaked coolant into the exhaust.

 

I have replaced the pre and post cat O2 sensor and checked the wiring. I have hooked up a code reader and monitored the O2 output. It is going from .2 to .8 up and down

 

I hope someone can help me with this question

 

Have u reset adaptations after all the changes?

has the Pcv been changed?

 

The P1498 will definitely cause an EML to be thrown. Check for vacuum leaks, even very small ones can throw the code. I had no noticeable running issues and even vacuum pressure seemed fine but the car still threw the P1498 along with an EML. It ended up being an assortment of small vacuum leaks that were difficult to find.

Check the fuel pressure regulator vacuum line, bypass valve line, and other small associated hoses. I also pressurized the vacuum system and sprayed soapy water on things which showed leaks on the supercharger inlet pipe at the plastic weld (2 month old charge pipe at this point with no visible cracks). Many leaks you won't be able to see without a pressure test and even a smoke test won't indicate them if you can't see the smoke clearly.

 

I have not changed the PCV valve yet.

 

What point in the vacuum system did you hook up to pressurize the system and how much pressure did you use?

 

I rigged up a pressure tester attached from the air box intake hose to avoid opening up the rest of the system. Let me know if you need some pictures it!

 

Pictures would be great if you have any. I question though, won’t the air get into any open cylinders and since there is just a little overlap in the valves wouldn’t leak down