DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Exhaust pipe moisture has evaporated (calculated engine run time between 0 and 200 seconds), then engine must run for longer than 80 seconds.
- Calculated exhaust gas temperature is less than 1472°F (800°C).
- Main relay voltage is greater than 10.5 volts.
DTC P0156 will set if HO2S bank 2 sensor 2 signal voltage rises whenever the heater circuit is being commanded off for 16 out of 24 times the heater is being turned off (heater is turned off once every 10 seconds).