Firstly lets end the myth-
deleting errors won't fix anything! This is the recovery driver's usual thought which then hinders the Fiat tech's diagnosis as all the fault data is lost.:bang:
Faulty lambda's won't stop an engine running. It will default to a limited operating strategy to get you home/ to a garage. It will still start!:bang:
A faulty knock sensor won't stop it running. It adjusts ignition timing to run as lean and fuel efficient as possible. If it fails- limp home mode! It's also not hard-wired into the loom!:bang:
Anyway, rant over. Check the usual things-
Is there fuel in the tank? Sounds silly but it's happened before!
Does the fuel pump prime? If not has the inertia switch been triggered?
Does it turn over as normal? Too fast- no compression (cambelt ok? you sure?) Too slow- bad battery/earth/etc
Is there a spark? (remove a plug lead & spark plug and rest on engine and crank)
A common fault is a failed crank (RPM) sensor- no spark, no injection. Only way to be sure is to check RPM and air pressure readings whilst cranking.
Thank v. much - excellent set of diagnostic steps.