P1143 Isuzu Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 1
Possible causes
– Faulty Front Heated Oxygen Sensor Bank 1
– Intake air leaks
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Fuel pressure
– Injectors
– Intake air leaks
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Fuel pressure
– Injectors
Tech description
If there are no intake air leaks, the most Possible Causes of the P1143 Isuzu code is the front O2 sensor bank 1.
What about the obd code?
The maximum and minimum voltage from the sensor are not reached to the specified voltages.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1143 IsuzuDescription
The heated oxygen sensor 1 is placed into the front tube. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.
Isuzu Vehicle:2013 Isuzu,2012 Isuzu,2011 Isuzu,2010 Isuzu,2009 Isuzu,2008 Isuzu,2007 Isuzu,2006 Isuzu,2005 Isuzu,2004 Isuzu,2003 Isuzu,2002 Isuzu,2001 Isuzu,2000 Isuzu,1999 Isuzu,1998 Isuzu,1997 Isuzu,1996 Isuzu,Isuzu Rodeo,Isuzu Trooper,Isuzu Ascender