Used Peugeot 208 Buying Guide: The PureTech Chain Class Action and Why the B9 Is the Safer Buy

The A9 PureTech chain was serious enough to trigger a class action. The B9 fixed it.

The A9 Peugeot 208 (2012–2019) is a stylish, well-packaged small car that aged well in terms of design. However, the 1.2 PureTech three-cylinder engine fitted to most A9 cars has a timing chain issue serious enough to have generated class action legal proceedings in both France and the UK. The B9 (2019–present) uses an updated chain and tensioner and is significantly more reliable. If budget allows a B9, it is the right choice. If you are buying an A9, the PureTech chain is your single biggest pre-purchase concern.

• B9 (2019–present): Best used buy. Updated PureTech chain. More resolved car overall.
• A9 (2012–2019): Available at lower prices but PureTech chain must be checked carefully.

A9 1.2 PureTech chain failure: what the DVSA record shows on a car that's already wearing

The 1.2 PureTech three-cylinder engine was fitted to the majority of A9 208 models sold in the UK. On pre-2019 units, the timing chain tensioner is known to wear prematurely — often before 60,000 miles on cars that have been driven predominantly on short urban trips (which prevents the engine from fully warming up and purging moisture from the oil). When the tensioner fails, the chain can stretch, rattle, and in worst cases skip a tooth or snap, causing valve damage. A timing chain and tensioner replacement at an independent Peugeot specialist costs £600–£1,200. The issue was serious enough that Peugeot extended warranties and settled claims on affected cars; check whether any warranty work was carried out via a Peugeot dealer using the VIN. A failing PureTech chain on a pre-2019 A9 produces 'engine noise' DVSA advisories when a tester hears it on the ramp during warm-up. One such entry on a pre-2019 A9 = the chain is already degraded.

• Symptoms: Rattling on cold start (disappears when warm). Oil consumption. Engine management warning light.
• Fix: Chain and tensioner replacement — £600–£1,200 at an independent.
• Prevention: Regular oil changes (every 12 months maximum, not 18,000-mile intervals) reduce risk significantly.

PureTech carbon build-up: the secondary cost on higher-mileage A9 cars

The PureTech engine uses direct injection — fuel is sprayed directly into the cylinder rather than into the inlet port. This means intake valves are not washed by petrol passing over them, and carbon deposits gradually build up on the back of the valves over 50,000–80,000 miles. Symptoms include rough idle, hesitation under load, and slightly increased fuel consumption. A walnut blast clean (an inlet valve cleaning procedure) costs £150–£300 at a specialist and is effective. It is not a reason to avoid the car, but worth budgeting for on higher-mileage examples.

B9 1.2 PureTech: the updated chain — not the red flag the A9 is

The B9 generation (from 2019) uses a revised PureTech 100 or PureTech 130 engine with an updated timing chain and tensioner specification. The reported failure rate on B9 cars is significantly lower than on A9 units. While Peugeot has not issued a formal recall in the UK, the improvement in chain durability on post-2019 cars is well-documented by independent specialists. If you are buying a B9, the chain is still worth asking about on high-mileage examples, but it is not the red flag it is on an A9.

A9 1.4 HDi diesel: reliable engine, but DPF failure shows as an emission fail in the DVSA record

The 1.4 HDi diesel available on A9 models is a simple, older-design diesel that is generally reliable. Its main vulnerability in UK use is the DPF, which requires regular motorway runs to regenerate. On cars used primarily for short urban trips, the DPF can block within 50,000–80,000 miles — a forced regeneration or replacement costs £300–£800. DPF blockage shows in the DVSA record as an emission failure. An A9 1.4 HDi with a recent emission failure is a car where the DPF has been running blocked — factor in £300–£800 before you commit.

What your budget buys on an A9 or B9

At £3,000–£6,000 you are in A9 territory (2015–2019 with 50,000–80,000 miles). Budget for a chain inspection and potentially a chain replacement. At £7,000–£12,000 the B9 becomes the main target — 2020–2022 cars with 20,000–50,000 miles. £13,000–£18,000 covers later B9 GT and Allure Premium trims with low mileage.