2026-08-15 · 5 min read
BMW 3 Series Spark Plugs Malaysia — N20/B48
N20 and B48 use 4 iridium spark plugs — replace every 60,000 km. OEM NGK ILZKAR8H8 or Bosch. Malaysia workshop cost RM 250–450 including labour. Ignition coil failure is common at the same mileage — inspect all 4 coils.
Plug Specification by Engine
- N20 4-cyl (F30): 4 iridium plugs, every 60,000 km
- N55 6-cyl (F30 335i): 6 iridium plugs, every 60,000 km
- B48 4-cyl (G20): 4 plugs, every 60,000 km
- B58 6-cyl (G20 340i): 6 plugs, every 60,000 km
- Malaysia cost: 4-cyl RM 220–420; 6-cyl RM 380–680
Worn Plug Symptoms
Worn iridium plugs on the N20/B48 cause misfires (P030X codes), rough idle and reduced fuel economy. Because the N20 has direct injection, worn plugs also worsen carbon buildup on the intake valves by disrupting combustion. Always use BMW-specified plugs — cheap aftermarket plugs can cause VANOS and ignition timing faults.