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Old 03-22-2013, 01:48 AM
bimmerfan52 bimmerfan52 is offline
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Location: Arizona
Join Date: Feb 2012
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Mein Auto: 545i
Originally Posted by mgunner42 View Post
just got excessive emission code on my 2004 545i and when i hooked up code reader said it was thermostat with coolant not reaching desired temp so looks like i am gonna be replacing only a thermostat if i am lucky.
Read your fault code - if P0128 then pull off the harness on the thermostat and measure the resistance across the two conductors in the connector in the thermostat. Should read around 16ohms. If it reads 1 your thermostat heater coil is open (failed) and replacing the thermostat will correct your problem.
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