service engine soon came up and i use my scantool to read and get p0128 and clear it and it cameup again a week after. Please what do i do?
BMW Q&AAsk Your Question
2004 BMW X5 Question: service engine soon (p0128)
Answer #1Angelo2975 September 14, 2011, 13:09Technician
P0128 Engine coolant temp sensor
Answer #2mastertech6371 September 14, 2011, 15:20Master
I would make sure your thermostat is working correctly before jumping to any conclusions. it is the most common failure for the 128 code.
ReplyAngelo2975, September 14, 2011, 18:47Technician
mastertch6371 your correct i forgot to add that
Answer #3PARTS GUY September 14, 2011, 18:48Master
Answer #4chinasinoy September 14, 2011, 19:58Journeyman
this is obd2 trouble code table,http://www.chinasinoy.com/service/how-to-understand-troub...
it can help you understand the meaning of the code, for this code, you can try this,
Verify coolant strength & level.
Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
If the above items check out good, replace the thermostat.
Answer #5patrick mannion from Greg Solow's Engine Room, September 14, 2011, 22:06Master
Yep! BMW, thermostat issue.
Replymastertech6371, September 15, 2011, 06:19Master
yep, what a surprize.