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Munich's fourth-generation 'compact premium' hatchback switches to mild-hybrid petrol power

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Somehow, after two decades of effort, Munich has still to fulfil its true potential when it comes to its smallest model, the BMW 1 Series.

For two model generations and 15 years, it tried – and, notably, failed – to make a rear-drive layout work as an outstanding dynamic selling point. And since then, it has been trying – and, arguably, failing – to execute a more conventional, natively front-driven family hatchback with a BMW-typical sporting edge.

It’s with a rather hollow self-aggrandising air, then, that the firm hails the 1 Series as “the pioneer of driving pleasure in the premium compact segment” - and, similarly questionably, that it announces this road test subject as a fully fledged fourth generation of the five-door hatchback, when it would seem to amount to little more than a heavy facelift. 

Nevertheless, here we are. The 1 Series has a new 48V mild-hybrid petrol powertrain to set it apart, as well as a stiffened chassis, retuned suspension, updated interior and freshened exterior styling. 

It returns to a family hatchback segment where competiton remains fierce, however, taking on everything from old premium rivals such as the Audi A3 Sportback and Mercedes-Benz A-Class to more mainstream fare such as the Volkswagen Golf, Mazda 3 and Peugeot 308. And that's to say nothing about the increasing number of EV rivals, given that the entry level is one of the few areas in which BMW is yet to offer an electric car.

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DESIGN & STYLING

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BMW 1 Series review 2025 02 panning

In a similar vein to the 'new' BMW X3 that we tested recently, BMW has clearly chosen to enhance and improve what it already had with the Mk3 1 Series from a technical standpoint. But that doesn’t make this a ‘new bumpers and headlights’ update.

Keener-eyed observers may notice that the bonnet line is lower than it used to be, but the new car is also 25mm taller in the roofline than the one it replaces. It is also 42mm longer than before, yet it has the same 2670mm wheelbase.

The 1 Series gets a new take on the traditional BMW double kidney grille that mixes vertical and diagonal bars. It’s a little fussy, but give us this over a light-up one any day.

There’s a bit more aggression and definition about the body design (most testers approved) and BMW’s M Sport bodykit (notably the bigger central air dam and lateral intakes at the front and mock diffuser at the rear) certainly builds on the sense of visual purpose.

Under the skin, the car retains the UKL2 architecture that it shares with the BMW X12 Series Active Tourer and 2 Series Gran Coupé, as well as the Mini Countryman. That platform continues to confer a transverse-mounted engine up front and native front-wheel drive on the car, while suspension is all-independent, via coil springs, struts at the front and a multi-link axle at the rear. BMW has added rigidity to the steel chassis but also reappraised the axle design and wheel kinematics, most notably adding 20% more caster angle at the front for more positive-feeling steering. Preloaded anti-roll bars have been adopted for keener lateral body control, as have new frequency-selective dampers. 

As ever, if you go for an M Sport car like our 120 test subject, you get a quicker steering rack, firmer and shorter springs (which deliver an 8mm drop in ride height) and adaptive M dampers, which continuously adapt to the road and driving situation, but don’t have driver-selectable modes.

Under the bonnet, the engine range has shrunk somewhat. The four-wheel-drive M135 xDrive actually brings slightly less power and torque (297bhp, 295lb ft) than its immediate predecessor had. Beneath that, for UK buyers at least, sits only one other option: the 120.

Powered primarily by BMW’s 1.5-litre three-cylinder ‘B38’ turbocharged petrol engine making 155bhp on its own, this car has 48V mild-hybrid assistance (a first for a 1 Series) via a 20bhp, 41lb ft electric motor housed within the standard-fit seven-speed dual-clutch automatic gearbox. A combined 168bhp makes it a little less powerful than the previous-generation 120i but, at 207lb ft, it’s equally torquey.

INTERIOR

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BMW 1 Series review 2025 11 dash

Just like the exterior, the new car’s cabin architecture is very apparently derived from that of the old one, making the typical hatchback hip point and semi-recumbent driving position feel familiar. So too are the locations of the instruments and controls and the levels of accommodation.

The car remains a mid-sized option in a class with bigger hatchbacks like the Skoda Octavia at one end and smaller ones like the Peugeot 308 at the other. It offers more front- and back-row leg room than the Volkswagen Golf eHybrid that we measured recently but less head room in both rows. In the case of the 120, the 1 Series also loses some boot space to the 48V hybrid battery, cutting that from 380 litres to a less-than-class-competitive 300 litres. As is typical of BMWs, it provides well for longer-legged drivers, however, and has plenty of steering column adjustment range, although testers did notice the lack of adjustable lumbar support in the front seats.

BMW's ‘M illuminated aluminium hexacube’ ambient-backlit trim can pulse in M colours. There is, however, an unilluminated mock-carbonfibre option if you find novelty lighting features distracting.

The old 1 Series’ instrument cowl has gone, and likewise its physical heating and ventilation controls on the centre stack, with many secondary controls moving to the ‘Curved Display’ that integrates instruments and multimedia functions into one digital installation. Also missing is the car’s old iDrive physical cursor controller (see ‘Multimedia’ section below).

Owners get new multi-coloured ambient lighting features (colours change according to driving mode), a racier-looking M Sport steering wheel and nice M Sport-coloured stitching on the dashboard. This is a ritzier interior, certainly, but in terms of its layout and general usability while driving, it’s debatable if it really has progressed.

Multimedia - 3 stars

The 1 Series has had much the same reworking of its multimedia system here as the related X1 had in 2023. The new Curved Display provides instruments on a 10.7in screen and multimedia functions on a 10.3in central screen. But the iDrive-style physical menu controller on the centre console is gone, as are the physical heater controls, leaving you little option but to use the touchscreen.

A select few menu shortcuts appear on the screen’s right-hand margin, which help usability a bit, temperature controls are permanently displayed and you can put particular functions (ADAS system toggles, for instance) as shortcuts that are accessed via one downwards swipe. There’s also top-layer, quick-access navigation on the home page, which is useful.

The infotainment is also connected, so you can download upgrades or, with a BMW Digital Premium subscription, use various music apps, news services, video streaming and even download games. Yes, you can now play Uno on your 1 Series' touchscreen. There’s also Apple CarPlay and Android Auto connectivity.

But we do miss BMW’s cursor controller, which made it easier to scroll around a menu while glancing up and down from the road.

ENGINES & PERFORMANCE

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BMW 1 Series review 2025 23 engine

Damp and inconsistent test conditions didn’t stop our 120 narrowly beating BMW’s key performance claims for it. The seven-speed dual-clutch ’box has a firmer style of engagement than a torque-converter typically does, which didn’t help to maximise the car’s accelerative showing on a greasy surface. Still, it proved quick enough when it found purchase (0-60mph: 7.3sec), although perhaps only averagely athletic relative to hybridised rivals (Volkswagen Golf eHybrid, 7.2sec, Mercedes-Benz A200 7.8sec). If BMW wanted to set this car apart on a sporting basis, then, you would say it has left a little to chance.

The hybrid powertrain has reasonably convincing premium qualities besides, however. The engine starts and runs quietly and, being typical of a three-pot, revs more smoothly than an equivalent-sized four-cylinder. There’s limited audible richness, although BMW tries to boost the car’s vocal presence in Sport mode through some pretty transparent but inoffensive fake engine sounds.

Overall, the car goes well enough, sounds quite sporty at times and is moderately willing to be driven keenly for its driver’s amusement. But that this powertrain doesn’t really make a lasting impression in any of those respects – and that the 120 M Sport is ultimately at least as commendable for its smoothness and refinement – would rather expose any claim by its maker to have made the most engaging hybrid hatchback of its kind.

Step up to the M135, however, and the extra power is obvious. And while there might be a slight reduction in outright power from the previous generation (putting it slightly behind both the Mercedes-AMG A35 and Volkswagen Golf R), you would be hard pressed to notice that ‘missing’ 6bhp: it will still complete the 0-62mph sprint in 4.9sec and there’s a pleasing hot-hatch ferocity to it.

That’s partly because the peak torque output of 295lb ft can be accessed from just 2000rpm, giving plenty of enjoyable accelerative thrust. If you use the throttle hard, the auto gearbox does a good job of holding gears longer to exploit that torque, or you can use the chunky steering wheel-mounted paddles for even more control.

The limited-slip differential on the front axle and the four-wheel drive system (which runs in front-wheel-drive mode most of the time but can send up to half the power through the rear axle) means that the M135 offers exceptional traction as well, even on damp roads. 

At higher loads, the engine does sound a touch synthetic, but in unstressed driving it does a good job of being well-mannered and unintrusive.

RIDE & HANDLING

BMW 1 Series review 2025 24 front cornering

BMW’s changes to the 1 Series’ suspension and steering tuning are certainly noticeable in the way the car goes down the road, although – on UK roads, at least – not in overwhelmingly or universally positive terms.

We tested the 120 in lowered, stiffened M Sport trim, so there would be cause to expect a milder and less animated ride from Sport models. But the M Sport (which will account for most UK sales) does struggle somewhat to keep its body settled and controlled, both at motorway cruising speeds and on country roads. 

The tuning of the adaptive dampers makes the car seem short on wheel travel and somewhat wooden in its body control over bigger-amplitude inputs. The way those dampers suddenly grab at the mass of the car, when the suspension is asked to work beyond a pretty ordinary level of deflection, can be quite uncomfortable-feeling at times in both rebound and compression, as if the struts are simply hitting their bump stops. This can’t have been the effect that BMW was aiming for, and more responsive, progressive damper tuning would suit the car better.

The handling is moderately agile but, along with the underlying firmness of the springing, there’s a primacy given to outright lateral grip and dependable stability in the car’s dynamic character, rather than directional incisiveness, mid-corner adjustability of cornering posture or general driver engagement.

The M135 has received a raft of further chassis upgrades in bid to improve stability and handing, including (over the 120) retuned dampers, stiffer stabiliser brackets at the rear and uprated brakes.

The steering is responsive and crisp and turn-in is good, with plenty of front-end grip. In fact, it’s quite hard to unsettle, with an ability to deploy enough grip to simply fire out of corners with minimal drama. It’s incredibly capable, although those who still remember the rear-driven M135i of old might find their spectacles becoming ever more rose-tinted.

MPG & RUNNING COSTS

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BMW 1 Series review 2025 01 front cornering

Having apparently given up on cheaper 116i and 118i models for the UK altogether, BMW has opened itself up to accusations of taking the 1 Series upmarket by stealth here – although, in light of wider industry trends, it’s only following the crowd.

The cheapest 1 Series on the UK price list - the Sport model - now sits just above £31,000, and that’s broadly in line with what Audi asks for a comparable A3 Sportback 35 TFSI and less than what Mercedes wants for an A200.

Sport trim gets you 17in wheels, LED headlights and a decent level of interior kit that includes a reversing camera and the access to the BMW Live Cockpit Plus system. BMW also notes that Sport is a leather-free, vegan-friendly trim level, with Anthracite-coloured cloth upholstery.

Prices rise to £33,065 for M Sport trim. That adds in 18in wheels and a lot of the exterior and interior sporty styling elements, including a leather sport steering wheel, heated sport seats and Alcantara/Veganza upholstery. More significantly, M Sport-spec cars also get the M Adaptive Suspension.

The M135 is priced from £43,000 and features more performance design features, including bespoke 18in alloys, various gloss trim elements and a quad exhaust system. It also comes with M Sport brakes and the adaptive suspension system.

Various single options are offered along with three packs for the 120, including a Technology Pack that adds in adaptive headlights and a wireless charger and a Technology Plus Pack that adds a head-up display and parking assistance.

There's also an M Sport Pro Pack offered on both the 120 and M135 that adds extra sporty design accoutrements, along with a rear spoiler and brakes.

For fuel efficiency, the 48V mild-hybrid system boosted the real-world economy of our test car around town but did little to enhance touring economy, which was unremarkable (45.8mpg, compared with the A200’s 59.3mpg).

VERDICT

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BMW 1 Series review 2025 26 static

The fourth-generation 1 Series isn’t the only new ICE car we’ve tested of late that feels more stopgap than standout. BMW isn’t the only brand hedging its bets and hoping its regular clientele won’t notice – but there is an unmistakable diluting effect on the end result.

The 120 uses its new-found mild-hybrid tech quite well, its digital cabin technology less so. The car’s pursuit of greater driver appeal is clear; but the delivery of it lacks coherence and true efficacy.

The decision to slim down the UK range to two powertrains makes things simple but does mean the 1 Series might suffer by comparison compared to rivals with far broader line-ups. That said, the two options available are well chosen. Pick the 120 and you get a versatile family runabout that remains among the sharper cars in its class to drive, without too many resulting compromises. Step up to the M135 and you get an accomplished hot hatch, albeit one that remains perhaps a little too serious for its own good at times.

After 20 years, the fact remains: if Munich wants to become the default choice for keener hatchback drivers, it must commit harder and offer more.

James Attwood

James Attwood, digital editor
Title: Acting magazine editor

James is Autocar's acting magazine editor. Having served in that role since June 2023, he is in charge of the day-to-day running of the world's oldest car magazine, and regularly interviews some of the biggest names in the industry to secure news and features, such as his world exclusive look into production of Volkswagen currywurst. Really.

Before first joining Autocar in 2017, James spent more than a decade in motorsport journalist, working on Autosport, autosport.com, F1 Racing and Motorsport News, covering everything from club rallying to top-level international events. He also spent 18 months running Move Electric, Haymarket's e-mobility title, where he developed knowledge of the e-bike and e-scooter markets. 

Matt Saunders

Matt Saunders Autocar
Title: Road test editor

As Autocar’s chief car tester and reviewer, it’s Matt’s job to ensure the quality, objectivity, relevance and rigour of the entirety of Autocar’s reviews output, as well contributing a great many detailed road tests, group tests and drive reviews himself.

Matt has been an Autocar staffer since the autumn of 2003, and has been lucky enough to work alongside some of the magazine’s best-known writers and contributors over that time. He served as staff writer, features editor, assistant editor and digital editor, before joining the road test desk in 2011.

Since then he’s driven, measured, lap-timed, figured, and reported on cars as varied as the Bugatti Veyron, Rolls-Royce PhantomTesla RoadsterAriel Hipercar, Tata Nano, McLaren SennaRenault Twizy and Toyota Mirai. Among his wider personal highlights of the job have been covering Sebastien Loeb’s record-breaking run at Pikes Peak in 2013; doing 190mph on derestricted German autobahn in a Brabus Rocket; and driving McLaren’s legendary ‘XP5’ F1 prototype. His own car is a trusty Mazda CX-5.