BMW 318i 320i G20 B46 Timing Chain Rattle Cold
BMW
3 Series
2019
B46 2.0 Petrol
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Indirect risk — worth monitoring, not urgent
Urgency Level
🟡 Monitor Closely
The B46 four-cylinder in G20 318i/320i can develop timing chain tensioner rattle at cold start above 80,000 miles. Updated tensioner from BMW. Cost: £500-900.
Repair / Solution
No confirmed fixes yet. Share yours below.
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this BMW 3 Series 2019 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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