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If you are on a budget replace the two that are bad. How old are the others? If they have 60-80,000 miles on them you may want to consider replacing them as preventative maintenance. Be sure to buy the O2 tool for removing them it makes changing the sensors a very simple job. It is possible to do it with out the tool but just more time consuming. Check the Article Section to see if there is a DIY.
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2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer
2001 X5 3.0i Sport 335,448 miles & counting...
SMG M3 Steering wheel
E46 Stainless Racing Headers
4.6is Exhaust
Turner Pulleys
Afe Intake
Brembo drilled rotors
PowerFlex Bushings
Hualingan
30mm H&R Spacers rear
20mm H&R Spacers front
Bavarian Autosport High-Performance Coils
Active Autowerke's Performance Software
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