BMW 1 Series: Best Years and Years to Avoid
The 1 Series changed character twice: rear-wheel-drive E87 and F20 hatches, then the front-wheel-drive F40. None is a blanket avoid, but the good and bad engines sit side by side within each generation. Pick the engine and year carefully and the 1 Series is one of the cheaper ways into a well-built used BMW.
Quick answer
Best all-round pick: an F20 with the B48 petrol or B47 diesel, or a later N20/B-series 120i/120d. Be most careful with pre-2015 N20 petrols, N47 diesels and the tiny N13 1.6. The M135i/M140i (N55/B58) are the enthusiast picks and generally robust.
F40 (2019-present) Buy
Chassis: F40
The current 1 Series switched to front-wheel drive and BMW's modular engines. It is the most reliable generation to date, with faults so far limited to minor electronics. The M135i offers strong performance from a proven four-cylinder turbo.
| Best years | Any F40 is a reasonable buy. 118i and 120d with full history are the value picks; the M135i is the hot-hatch choice. |
| Years to watch | Very early 2019 cars may have had software updates; check infotainment and driver-assist features work correctly. |
| Engines to trust | 118i (B38), 120i (B48), 118d (B47), 120d (B47), M135i (B48) |
| Engines to check | Early cars with outstanding software updates |
Key risks
- Occasional infotainment and software glitches on early cars
- B47 diesel DPF regeneration needs; avoid short-trip-only cars
- Front-wheel-drive platform: check for kerbed wheels and front tyre wear
F20 / F21 (2011-2019) Mixed
Chassis: F20, F21
The last rear-wheel-drive 1 Series and a favourite for that reason. Quality depends heavily on engine choice. Later facelift cars with B-series engines are the ones to target; early N13 petrols and N47 diesels are the ones to scrutinise.
| Best years | 2015-2019 LCI cars with the B48 petrol or B47 diesel, or the well-regarded B58-powered M140i, are the durable choices. |
| Years to watch | 2011-2015 116i/118i with the small N13 1.6 turbo, and early N47 116d/118d/120d diesels for timing-chain history. |
| Engines to trust | M140i (B58), 120i (B48), 120d (B47, later), M135i (N55) |
| Engines to check | 116i / 118i (N13 timing chain and carbon), 116d / 118d / 120d (N47 timing chain), 125i (N20 pre-2015) |
Key risks
- N13 1.6 turbo: timing chain wear and carbon build-up on the BMW-PSA engine
- N47 diesel rear timing chain on early cars
- N20 (125i) pre-2015 timing-chain stretch
- Diesel DPF and EGR problems on short-trip cars
E81 / E82 / E87 / E88 (2004-2013) Mixed
Chassis: E81, E82, E87, E88
The original 1 Series is now genuinely cheap, and condition varies widely. Some engines are dependable; the early N47 diesel and the turbocharged 135i (N54) carry documented, costly failure modes. Age and rust matter as much as the engine now.
| Best years | 2007-2011 120i/125i (N43/N52) or a well-kept 118d/120d with proof of chain work are the sensible ways into an E87. |
| Years to watch | Early N47 diesels (2007 on) for the rear timing chain, and the 135i (N54) for fuel-pump and wastegate issues. |
| Engines to trust | 116i / 118i (N45/N46), 125i (N52, later coupe), 120d (M47, with history) |
| Engines to check | 135i (N54 HPFP and wastegate), 118d / 120d (N47 timing chain), 118i / 120i (N43 injectors) |
Key risks
- N54 (135i): high-pressure fuel pump, wastegate rattle and injector failures
- N47 diesel rear timing chain, expensive on some builds
- N43 direct-injection petrol: injector and fuel-pump issues
- Age-related rust, cooling and electrical faults on high-mileage cars
The pick of the range
For most buyers, a 2015-2019 F20 120d (B47) or 120i (B48) with full service history is the sweet spot: rear-wheel-drive character, modern reliable engines and low running costs. If you want the newest and most trouble-free car, an F40 118i or 120d is the safer bet. Enthusiasts should target an F20 M140i (B58), a fast and comparatively durable straight six.
What to avoid, and why
Approach with most caution the pre-2015 N13 116i/118i (1.6 turbo with timing-chain and carbon issues), any N47 diesel without chain receipts, and the E82/E88 135i (N54) unless its fuel-pump and wastegate history is documented. None are automatic walk-aways, but each can generate large bills without the right evidence, and on cheap early cars the repair can exceed the car's value.
Check a specific 1 Series listing
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Get your report →Bimmer.AI is designed to help you identify BMW-specific buyer risks before you travel, negotiate, or pay for an inspection. It does not replace a physical inspection by a qualified mechanic, a legal vehicle-history check (e.g. HPI Check), or independent verification of finance, stolen, or write-off status. Repair-cost ranges are indicative UK figures that vary by region, specialist, parts supply, and labour rates.
Frequently asked questions
What is the most reliable BMW 1 Series year?
The current F40 generation (2019 on) is the most reliable, using BMW's modular B-series engines. Among rear-wheel-drive cars, a post-2015 F20 with a B48 petrol or B47 diesel is the standout durable choice.
Which BMW 1 Series should I avoid?
No generation is a blanket avoid. Be most careful with the pre-2015 N13 1.6 petrol, any N47 diesel lacking timing-chain history, and the 135i (N54) without fuel-system evidence. Each needs receipts before you buy.
Is the F20 1 Series reliable?
On the right engine, yes. Post-2015 cars with B48/B47/B58 engines are durable. The early N13 petrol and N47 diesel need careful checking for chain and carbon issues respectively.
Is the BMW 135i (N54) a good used buy?
It offers a lot of performance for the money, but the N54 twin-turbo has documented high-pressure fuel pump, wastegate and injector issues. Only buy one with a clear record of that work, and budget for future fuelling and turbo repairs.
Is the front-wheel-drive F40 1 Series worse than the old rear-drive cars?
Different, not worse. The F40 is more practical and, so far, more reliable, using proven modular engines. Enthusiasts who specifically want rear-wheel drive should look at the F20, but for everyday use the F40 is the safer buy.
Does the BMW 1 Series have timing chain problems?
Three engines are the concern: the N13 1.6 petrol, the N47 diesel and the pre-2015 N20 petrol, all in E87 and early F20 cars. Later B-series engines are far more robust. Check for chain history on the affected engines.