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PreCat O2 Sensor Replacement
BMW 540i (E39)
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Usual symptoms: engine stalls on idle or poor idle; Check Engine error light will also be on, poor fuel economy

My Peake tool confirmed that my PreCat O2 Sensor has failed.

 Cut and paste this url and share this link: http://roymalinao.com/default.asp?tln=1&sln=97&coid=8&sid=287
  • 10mm Socket Wrench
  • 22mm Socket Wrench or 22mm FlareNut Open Wrench
  • small flat-head screwdriver
  • Jack (I used this in conjunction with the FlareNut wrench, see pics)
  • Ramp
  • O2 Sensor, BMW P/N: 11-78-1-247-406
  • Peak R5/FCX Reset Tool (optional)
 Cut and paste this url and share this link: http://roymalinao.com/default.asp?tln=1&sln=97&coid=8&sid=288

As per recommended BMW maintenance schedule, this part is also recommended to be replaced every 100K miles.

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