Difficult Or No Start (Cranks Okay): Aerio

Faulty spark plugs. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article.
Faulty ignition coil. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article.
Idle air control system. See B-6: IDLE AIR CONTROL VALVE SYSTEM CHECK under CIRCUIT TESTS in BASIC DIAGNOSTIC PROCEDURES article.
Faulty Engine Coolant Temperature (ECT) sensor. See ECT sensor related DTCs in SELF-DIAGNOSTICS - AERIO 2.0L article.
Faulty Throttle Position (TP) sensor. See TP sensor related DTCs in SELF-DIAGNOSTICS - AERIO 2.0L article.
Faulty Mass Air Flow (MAF) sensor. See MAF sensor related DTCs in SELF-DIAGNOSTICS - AERIO 2.0L article.
Faulty fuel injector(s). See B-2: FUEL INJECTOR CIRCUIT INSPECTION under CIRCUIT TESTS in BASIC DIAGNOSTIC PROCEDURES article.
Fuel pressure out of specification. See FUEL PRESSURE under FUEL SYSTEM in SYSTEM & COMPONENT TESTING article.
Faulty Crankshaft Position (CKP) sensor. See CKP sensor related DTCs in SELF-DIAGNOSTICS - AERIO 2.0L article.
Check for low engine compression. See MECHANICAL INSPECTION under PRELIMINARY INSPECTION in BASIC DIAGNOSTIC PROCEDURES article.
Faulty Positive Crankcase Ventilation (PCV) system. See POSITIVE CRANKCASE VENTILATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article.