For ease:
AQH, AVP, AYS and BCS engine codes use 101 000 054AD plugs made by Bosch according to Etka and are currently £15.89 incl VAT each - my last plug change 4 years ago quoted them at about £12 each.
For AQG, AQF, ARU, AKC, AUW and AVN engine codes it's 101 905 615A at £15.43 each
ElsaWin doesn't go into any detail on a plug change, but does state that the plugs should be torqued to 30Nm
ElseWin
Checking ignition system
Technical data for ignition system
Engine code letters
AQF 4.2 L 228 KW / AUW 4.2 L 228 KW
ARU 4.2 L 175 KW / AVN 4.2 L 175 KW
AQG 3.7 L 191 KW / AKC 3.7 L 191 KW
AQH 4.2 L 265 KW / AVP 4.2 L 265 KW
Ignition timing is determined by the control unit.
Ignition timing cannot be adjusted.
Ignition system
Individual coil system with 8 ignition coils connected directly to spark plugs via spark plug connectors (common component ignition coil and performance output stage).
Spark plugs
Spare part number and manufacturer description
see spare part catalogue
Tightening torque
30 Nm
Firing order
1-5-4-8-6-3-7-2
ETA: According to Bosch site, the recommended plugs are FGR6KQE which Euro Car Parts list under 'OE quality spark plug' with a Bosch picture, but then state may not be the brand supplied. Be worth ringing and asking if they are that part number and Bosch as they're quoted at £6.72 each incl VAT!
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Last edited by Adrian E; 22nd September 2014 at 09:07 AM.
Reason: more info
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