Alfa Romeo 156 2017: Cold Start Engine Noise
A rattling or ticking noise from the engine compartment on cold start in your Alfa Romeo 156 2017 is often due to low oil pressure or a worn timing chain tensioner, common in this model's Twin Spark engines.
Diagnosis Details
Possible Causes
Worn timing chain tensioner or guides: The 2017 Alfa Romeo 156's Twin Spark engine is known for timing chain issues, especially on cold starts when oil pressure is low, causing a rattling noise.
Low engine oil level or viscosity: Insufficient oil or using the wrong grade (e.g., too thick) can cause hydraulic lifters to not pressurize quickly, leading to ticking on cold start.
Exhaust manifold leak: A small crack or gasket leak can create a ticking sound that is more noticeable when the engine is cold and metal contracts.
Related OBD-II Codes
Not satisfied with this diagnosis?
Try Another DiagnosisWhat To Do Next
What You Should Do
First, check your engine oil level and condition; top off if low and ensure you're using the recommended 5W-40 synthetic oil.
If the noise persists, have a mechanic inspect the timing chain tensioner and guides, as this is a known weak point on the Alfa Romeo 156 Twin Spark engine.
Avoid prolonged driving if the noise becomes louder or the check engine light comes on.
Related Repairs
Share this diagnosis
Help others with similar symptoms
Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.

