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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 02-11-2013, 08:09 AM
graves540i graves540i is offline
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Location: philadelphia, pa
Join Date: Jan 2013
Posts: 9
Mein Auto: 2003 bmw 540i m-sport
cause of O2 sensor fail??

i just replaced my thermostat in my 2003 540i. Now it is showing codes for two failed O2 sensors. Could the bad thermostat have caused the O2 sensors to fail??
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Old 02-11-2013, 09:23 AM
cn90 cn90 is online now
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Location: Omaha NE
Join Date: Mar 2006
Posts: 13,637
Mein Auto: 1998 528i 5-sp 140K+
O2 sensors are just like us human beings, they only live that long.
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