On ym freinds 240sx his digital speedo and heads up don’t work( problem for another day). how do I check the fault codes if I can’t see the check engine light?
From what I have read the Idle control knob on the back of the comp is used to check the codes. does this also actually control the idle?
So u turn the car to run turn the knob clock wise then conter. the 2 led’s inside the comp will flash the codes?