P1406: EGR valve pintle position circuit. Try cleaning any carbon deposits in your EGR valve. That's where I would start. I hope this helped and good luck.
Check for b+ and ground to your egr valve,if you have b+ and ground,remove the valve and see if it is stuck open,if it is not stuck you probably have a bad egr valve.
SOURCE: 2002 Saturn SL1 check engine light code P0303
For old models, Saturn/GM also used the same material
fiberglass gasket in your model, you almost certainly have a leak from
a crumpled, sucked-in gasket as I suffered (and many others). I would
say going to Saturn dealership to make repairs is probably not good
idea if they are going to put in the same GM intake gasket part. Maybe
possible to specify Felpro gasket with whatever shop you go to if you
don't do the repair yourself. I would not go too long with your car in
that condition as there is localized leaning at your cyl-3, that could
cause a burnt exhaust valve there.
The exhaust is extra hot venting out
that cylinder. P0303 is misfire at cyl-3. Mine was P0301 (cyl-1). You
may get P0507 once in a while when PCM fails to control the fast idle
caused by the leak under certain conditions. Most of the time, it is
very slow idle caused by 3 cylinders running. You run smoother in cold
idle because the IAC opens up to increase idle and end up lowering the
manifold vacuum, so the reduced vacuum causes less leaking at the
failing intake manifold gasket.
I'd say try cleaning everything with your ignition before replacement; Idle problems could be caused by engine coolant sensor (ECTS). Are you sure it was changed? Did they put on a new wire connector along with it?
Hope helps.
SOURCE: where is the diagnostic port on 1995 saturn sl1
DIAGNOSTIC OR ASSEMBLY LIND DATA LINK LOCATED UNDER THE DRIVER SIDE DASHBOARD NEAR THE KICK PANEL TO RETRIEVE TROUBLE CODES USE A JUMPER WIRE TO B AND A TERMINAL TWO TOP FAR TO RIGHT TERMINALS SIDE BY SIDE B AND A . CHECK ENGINE LIGHT WILL GIVE YOU MORSE CODE.LIKE TWO FLASHES PAUSE FEW SECONDS THEN FLASH THREE MORE TIMES THAT IS CODE 23 BUT A CODE SCANNER QUICKER BUT JUMPER WIRE CODE TRICK WORK AS GOOD IF YOU DONT HAVE CODE SCANNER. BUT YOU NEED CODE BOOK TO SEE WHAT CODES YOU ARE RECEIVING FROM PCM.
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