Volvo S40 The S40 is Volvo's most affordable sedan with all the amenities of a luxury sports car.

PO128/Check Engine

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Old Jan 3, 2013 | 02:46 PM
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Heath's Avatar
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Default PO128/Check Engine

I have a 2002 S40 and have had the PO128 issue come up a couple of times. This time I've changed the thermostat and ETC sensor twice and the check engine light is still on. I've also added coolant. Any ideas?
 
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Old Jan 3, 2013 | 05:51 PM
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GerBeGurGya's Avatar
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Replace the coolant completely buy only OEM thermostat.
 
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