2017 1 Series diesels are commonly 116d/118d/120d and usually come with BMW’s automatic Steptronic gearbox (an 8‑speed on many models). Diesel models have a DPF and EGR so they prefer regular longer runs rather than short urban trips; also confirm the exact engine code because some earlier 2.0d (N47) engines had timing-chain service bulletins, while later B47 units are more robust. BMW parts are widely available in Ireland but dealer servicing and parts are pricier than mainstream brands, and the automatic gearbox service history is worth checking specifically.

• DPF and EGR health — ask for evidence of regular motorway runs/long regenerations and watch for heavy soot smell or frequent regeneration warnings.
• Automatic gearbox behaviour and service history — shifts should be smooth with no jerk, delay or slip; ask whether gearbox oil/filter was changed at recommended intervals.
• Turbocharger and oil leaks — check for blue/black smoke under hard acceleration and look for oil around the turbo inlet and valve cover seals.
• Confirm the exact diesel engine code (116d/118d/120d) and any timing-chain or recall service history if the car has the older N47 2.0d variant.
• Suspension and rear-seat comfort — check for worn drop-links/bushes and limited rear legroom; inspect wheel-arch and lower sills for corrosion typical of a 9‑year-old hatch.