Hello
I had the preheat fault on my Stilo and it wasn't the glowplugs. On mine it was the wiring harness (consists of 4 wires)that runs from the heater relay/module to each glowplug. One of those wires had a bad connection to one of the plugs therefore bringing up the preheat fault. I'm sorry if you have mentioned this in you post but does the fault come up everyday? I should have asked this first . The error on mine was intermittent and although Fiat reckoned it was a faulty plug my mechanic and my local car spares shop thought otherwise. They were right
Phil
I had the preheat fault on my Stilo and it wasn't the glowplugs. On mine it was the wiring harness (consists of 4 wires)that runs from the heater relay/module to each glowplug. One of those wires had a bad connection to one of the plugs therefore bringing up the preheat fault. I'm sorry if you have mentioned this in you post but does the fault come up everyday? I should have asked this first . The error on mine was intermittent and although Fiat reckoned it was a faulty plug my mechanic and my local car spares shop thought otherwise. They were right
Phil