116i / 118i / 120i (N46, 2004–2007)
2004–2007 · petrol · 1995cc · 150hp
Engine codes: N45, N46
Reliability, common problems and owner reviews for the Bmw 1 Series E87 116i / 118i / 120i (N46, 2004–2007). Check this before you buy used.
The earlier 4-cylinder petrol — reasonable but the N45/N46 timing chain stretches (mainly 2004–2007), and these are interference engines so a skipped chain damages valves. Also watch oil leaks and the usual age items. Less troublesome than the later DI N43, but listen for chain rattle.
Same engine, other cars
This is the same physical engine (N45) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
N45/N46 chain elongates (2004–2007); interference engine → valve damage if it skips. Cold-start rattle warns.
Fix / Workaround: Replace chain + guides at first rattle.
Repair cost: €600–€1300
Typically appears after: 130,000 km
Valve cover / gasket leaks with age.
Fix / Workaround: Replace gaskets.
Repair cost: €150–€500
Chain guides and VANOS units wear with age → rattle.
Fix / Workaround: Address rattle; replace guides/VANOS seals.
Repair cost: €400–€1200
Typically appears after: 150,000 km
Mileage Thresholds
After 130,000 km: Chain stretch window.
After 150,000 km: Chain/VANOS and leaks appear.
Pre-Purchase Checklist
- ☐Cold-start rattle check (chain)
- ☐Inspect oil leaks
- ☐Less troublesome than the N43
- ☐Cold-start rattle check
- ☐Inspect for oil leaks
- ☐Prefer over the N43 2.0 petrol
Frequently asked questions
Is the Bmw 1 Series E87 116i / 118i / 120i (N46, 2004–2007) reliable?
Maint. Sensitive — The earlier 4-cylinder petrol — reasonable but the N45/N46 timing chain stretches (mainly 2004–2007), and these are interference engines so a skipped chain damages valves. Also watch oil leaks and the usual age items. Less troublesome than the later DI N43, but listen for chain rattle.
What are the common problems and reviews for the Bmw 1 Series E87 116i / 118i / 120i (N46, 2004–2007)?
The most commonly reported problems: Timing chain stretch, Oil leaks, Timing chain / VANOS wear.
Is a used Bmw 1 Series E87 116i / 118i / 120i (N46, 2004–2007) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.