You have 2 oxygen sensors( bank 2 sensor 1) and ( bank 1 sensor 1)
and you have the heated oxygen sensor ( bank 1 sensor 2)
On V- types engines one sesor will be referred to as Bank I sensor1 and the other as Bank @ sensor 1.
The oxygen sensor after the catalytic converter is used by the ECM primarily to determine catalytic converter efficiency.
This sensor is referred to as sensor 2.
With two catalytic converters, one sensor will be Bank 1 sensor and the other as Bank 2 sensor 2.
Check the two sensors.
For the heated Oxygen sensor (bank 1 sensor 2)
Use OBD II to mesure the voltage signal on the last one.
If OBD 11 scan tool is used, refer to the repair manual for conversion.
The A/F is designed so that at stoichiometry, there is no curent flow and the voltage put out by the detection circuit is 3.3 volts. Arich mixture, which leaves very little oxygen in the exhaust stream, produces a negative current flow. The detection circuit will produce a voltage below 3.3 volts.A Lean mixture, which has more oxygen in the exhaust stream, produces a positive curent flow. The detection circuit will now produice a voltage signal above 3.3 volt.
*check for vacuum leak, and EGR leak, Excessive fuel pressure, check both the sensors( Contamination or corrosion of the platinum electrodes or Zirconia elements will reduice the voltage signal output, contamination from the negine coolant, excessive oil consuption, additive used in sealants, and the wrong additives in gasoline, For the Oxygen Sensor Heater check the engine coolant temperature and engine load( determined from the MAF or MAP sensor signal) this heater circuit uses approximatly 2 amperes using a DVOM.
:) good luck
Wednesday, January 10th, 2007 AT 11:54 PM