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Thermostats keep the engine hot enough to heat cats. If a thermostat is not working properly, at highway speeds the engine runs cooler but won't set codes. A thermostat maintains engine temp constant for NOx burning. The instrument gauge doesn't swing enough to see temp changes. For it's age, a new thermostat is good maintenance. Does it have OEM plugs in it? Or updated single filament iridium plugs? Does voltage swing up and down on front O2 sensors. Voltage should swing. The rear O2 sensors should read a more constant voltage. Some scanners can read cat temps. Are both cat temps close in readings?
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'06 X5 3.0i - bought @143,123 miles (12/26/20)
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04-15-2025, 07:05 AM
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