Trouble code P0420 means: Catalyst system efficiency below threshold (bank 1)
On a 1996 Mercury Cougar ( 3.8 litre V6 and 4.6 litre V8 engines ) Bank 1 is the passenger side of the engine Sensor 2 is in the exhaust AFTER the exhaust has passed through the catalytic converter ( downstream sensor , also called catalyst monitor )
On a 1995 Mercury Cougar ( V8 and V6 ) Bank 1 is the passenger side of the engine Sensor 1 would be close to the engine before the exhaust passes through the catalytic converter
firewall 1-----2-----3 ( bank 1 ) 4-----5-----6 ( bank 2 ) front of 1999 Mercury Cougar ( V6 )
P0420 Catalyst System Efficiency Below Threshold (Bank 1)Check for bad catalytic converter or O2 sensor on the downstream side
Trouble code P0420 means: Catalyst System Efficiency Below Threshold (Bank 1) Replace O2 Sensor?
The oxygen sensor for bank 1 sensor 1 for a 2000 mercury mountaineer is on the cylinder #1 side.
On a Mercury Cougar , 2.5 litre V6 engine : firewall 1-----2-----3 ( bank 1 ) 4-----5-----6 ( bank 2 ) front of vehicle > driver
On a 1999 Mercury Cougar , 2.5 litre V6 engine : firewall 1-----2-----3 ( Bank 1 ) 4-----5-----6 ( Bank 2 ) front of vehicle > driver
the rear one ========================================================== On a 1995 Mercury Cougar , 4.6 liter V8 engine : ( Bank 2 ) is the drivers side of the engine
How do you fix a p0420 bank 1 on a 05 dodge stratus
P0420, bank one catalytic converter efficiency failure.