Bank 2 is the drivers side of your engine , Sensor 1 is in the exhaust before the
catalytic converter ( upstream )
The 2003 Mercury Grand Marquis came equipped with the 4. 6L V8. Oxygen (O2) sensor locations are upstream and downstream (before and after the catalytic converters).
On a 1998 Mercury Grand Marquis : Bank 2 is the drivers side of the engine Sensor 1 would be in the exhaust close to the engine before the exhaust enters the catalytic converter ( upstream sensor )
Location of coolant temperature sensor on a 2003 Mercury Grand Marquis?Read more: Location_of_coolant_temperature_sensor_on_a_2003_Mercury_Grand_Marquis
on the transmission
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis
Mercury Grand Marquis was created in 1983.
next to the crank pulley
On a 1999 Mercury Grand Marquis : The Mass Air Flow Sensor should be between the engine air filter and the big engine air intake tube
On a 1996 Mercury Grand Marquis , 4.6 liter V8 engine : Bank 1 is the passenger side of the engine Sensor 2 would be AFTER the exhaust has passed through the catalytic converter
On a 1997 Mercury Grand Marquis : Bank 2 is the drivers side of the engine and ------------------------------------------------------------------------------------------ Sensor 1 would be close to the engine before the exhaust enters the catalytic converter Sensor 2 would be AFTER the exhaust has passed through the catalytic converter ( also called a catalyst monitor )
Bank 1 is the passenger side of the engine in a Mercury Grand Marquis Sensor 1 would be in the exhaust close to the engine before the exhaust enters the catalytic converter ( upstream sensor )
where is the running light sensor on a 2003 grand marque