P0128 info and help please - BMW M5 Forum and M6 Forums
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post #1 of 11 Old 4th February 2016, 03:23 PM Thread Starter
Dave Spalding
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P0128 info and help please

Hey folks. A few days go my engine management light came on. No big deal read the code and cleared it. Today the light came back on, same code (P0128).

On both occasions the car had been running for less than 5 mins and had covered less than a mile. Both times from cold start up.

Any ideas on causes? Surely the car wouldn't expect to be warmed up by that point anyway?
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post #2 of 11 Old 4th February 2016, 03:50 PM
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Originally Posted by Dave Spalding View Post
Hey folks. A few days go my engine management light came on. No big deal read the code and cleared it. Today the light came back on, same code (P0128).

On both occasions the car had been running for less than 5 mins and had covered less than a mile. Both times from cold start up.

Any ideas on causes? Surely the car wouldn't expect to be warmed up by that point anyway?
P0128 info and help please-p0128.jpg
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post #3 of 11 Old 4th February 2016, 04:02 PM Thread Starter
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Brilliant mate thanks. So test the switch first then if that's fine replace the thermostat?
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post #4 of 11 Old 4th February 2016, 04:02 PM Thread Starter
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Brilliant mate thanks. So test the switch first then if that's fine replace the thermostat?
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post #5 of 11 Old 5th February 2016, 03:52 AM
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post #6 of 11 Old 5th February 2016, 11:33 AM Thread Starter
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Ok thanks. Replaced the one on my E39 M5. Was going to do this one but the garage a got the car from are doing it under warranty so saves me the hassle.
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post #7 of 11 Old 19th July 2017, 10:37 AM
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Hi everyone. Got p0128 code.
The thermostat was replaced about 2 months ago and water temperature sensor about 4 days ago along with Auxiliary fan switch just in case. (OEM sensors from trusted BMW shop)
Code came back again after cold start today.
Is there anything else could cause this code?
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post #8 of 11 Old 25th July 2017, 01:51 AM
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Yes, a thermostat that was incorrectly mounted and/or a pre-damaged thermostat housing. The thermostat slides up and down in the housing around 73C and if it was scored or damaged it may not slide properly preventing closure. As a result the coolant temperature is too low. This on its turn can induce the engine to run rich which over a long time will destroy your cats (if you have any).
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post #9 of 11 Old 25th July 2017, 05:54 AM
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Quote:
Originally Posted by rt7085 View Post
Yes, a thermostat that was incorrectly mounted and/or a pre-damaged thermostat housing. The thermostat slides up and down in the housing around 73C and if it was scored or damaged it may not slide properly preventing closure. As a result the coolant temperature is too low. This on its turn can induce the engine to run rich which over a long time will destroy your cats (if you have any).
Thank you for your time and help. I'm going to check on thermostat and will replace if needed.
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post #10 of 11 Old 9th February 2018, 04:52 AM
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I got the code recently. I'm wondering if the winter temperatures cause this issue. It's been in the 20s and 30s during the day, colder overnight. Any thoughts out there? Should I wait til the spring to see if the code comes back when it's warmer.
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