You turn the key, the starter motor cranks, but the engine refuses to fire. This issue is usually related to battery voltage, fuel delivery, ignition components, or sensors.

Possible Causes

• Weak battery (starter works but spark is weak)
• Faulty fuel pump or relay
• Clogged fuel filter
• Bad spark plugs or ignition coil
• Crankshaft or camshaft position sensor failure
• Injector malfunction
• Immobilizer not recognizing the key

Fixes

• Test battery voltage (should be 12V+ at rest)
• Listen for fuel pump prime when ignition is turned on
• Replace fuel filter if clogged
• Check spark plugs and coils, replace if worn
• Scan for fault codes with an OBD tool
• Test crankshaft sensor signals
• Try spare key if immobilizer issue is suspected