I want to check the code checker system in my series 5 rex. What would be the simplest way to create an error code? I have followed instructions to check codes but no signal ever flashes, so I question whether the check engine light is even working. Should it come on momentarily when the ignition is first switched on? Three years of rebuild time have passed since I last drove my car. Thanks to this forum, I hope to be back in the driver's seat real soon!

 

Unplug the airflow meter
Unplug the O2 sensor
Unplug the boost sensor
All should trigger their respective codes pretty readily.


-Ted

 

yes, as well as when you check them.

 

No response from check engine light.
All other idiot lights seem to function o.k.
How would I check for problem?
Thanks for interest Ted.