P0403 erg FIAT Scudo Estate (220_)

I had the same thing on mine about 2 years ago. Start with checking the connector on the EGR solenoid – mine was full of water and corroded as hell. Just disconnect it, clean with contact cleaner, and see if the code comes back.

@D.W. honestly on Scudo the solenoid is a pain to reach but doable. It's near the EGR valve itself, usually on the intake side. If you have basic tools just check visually first for damaged wires before buying parts.

@Thadine59 good advice but I'd add – use a multimeter to check resistance across the solenoid terminals. Should be around 4-12 ohms normally. If it's open circuit or zero, the solenoid is toast.​

My cousin had this on his Ducato (same engine basically). Turned out the wiring harness was rubbing against the exhaust manifold and melted through. Check where the wires run, especially near hot components.

@D.W. don't overthink it mate, 80% of the time with P0403 it's just the solenoid itself gone bad, not wiring. But yeah check the connector first like @QUIETVOICES said before spending money.

On my Scudo I removed the whole EGR valve to inspect everything properly – three bolts plus a wiring connector tucked in a hole on the side, easy to miss. While you're there check for carbon buildup too, that can make the solenoid work too hard and fry the circuit.

@Phillips_1 exactly, and also check for voltage at the connector with ignition on – should have 12V supply. If no voltage, trace the wiring back towards the ECU looking for breaks or shorts to ground.

I replaced the solenoid thinking that was it, but the problem was actually a short in the wire loom under the battery tray. Wasted 80 euros on the part. So definitely test the wiring thoroughly first with a meter.

@G.Hill.M +1 on checking carbon buildup, had mine completely clogged on a 220 Scudo diesel. The valve couldn't move properly so it stressed the electrical circuit and threw P0403. Cleaned it with carb cleaner and problem solved.

If you dont have a multimeter just wiggle all the wires and connectors around the EGR area with ignition on, sometimes you'll see the check engine light flicker if there's a loose connection or broken wire. Quick and dirty method but it works 😅.