- Remove left-hand section of engine spoiler.
See Group 46.
Note: The bottom fastener of the rear footrest plate is secured to the battery bracket. When removing the battery cover, slacken but do not remove the screw.
- Slacken screws securing rear left footrest plate.
- Remove left trim panel and battery cover.
- Remove front footrest plate.
![](https://motoinstruction.ru/img/bmw/21/127239.jpg)
- Release the cable tie for the oxygen sensor (arrow).
- Disconnect plug for oxygen sensor (1) and pull cable down to remove.
- Remove exhaust heat shield.
![](https://motoinstruction.ru/img/bmw/21/127240.jpg)
- Remove screws (arrows) of exhaust bracket and remove exhaust bracket.
![](https://motoinstruction.ru/img/bmw/21/127241.jpg)
- Remove eight screws (arrow) securing exhaust system to cylinder head.
- Extend side stand.
Note: Make sure the oxygen sensor clears the gearshift lever.
- Pull exhaust down to clear the stud and forward out of its holder.
- Lower the exhaust system to remove.
Removing oxygen sensor
![](https://motoinstruction.ru/img/bmw/21/127242.jpg)
- Unscrew the oxygen sensor at the hexagon (arrow).
- Installation is the reverse of the removal procedure: pay particular attention to the following.
- Lightly coat thread of oxygen sensor with Never Seez compound.
- Tighten the oxygen sensor at the hexagon with socket wrench insert, BMW No. 11 7 020.
- Replace the O-rings at the cylinder head.
- Clean threads in stirrup of exhaust bracket, coat screw threads with Loctite 243 and tighten.
- When installing, make sure cable of oxygen sensor is correctly routed and secured.
- Warm the engine up to its normal operating temperature and let it cool down again.
- Check security of all screws securing exhaust system to cylinder head.
Tightening torque:
- Oxygen sensor — 45 Nm
- Exhaust system to cylinder head — 22 Nm
- Stirrup to silencer — 21 Nm
- Stirrup to retaining plate — 30 Nm (clean thread + Loctite 243)
- Retaining plate to bearing mount — 41 Nm