P0130

Diagnostic Chart:

Schematic:

The heated oxygen (HO2S) bank 1 sensor 1 is threaded into the cylinder 1, 3, 5 exhaust manifold (cylinders 1, 3, 5 are closest to front of dash). The sensor is an electrical source that responds to oxygen content in the exhaust manifold. When the sensor reaches approximately 316°C (600°F), it is fully functional and produces a voltage based on the difference in oxygen between the atmosphere and exhaust gas. The ECM sends a 450 mV bias voltage on the signal line, which is pulled up through high resistance. When the HO2S bank 1 sensor 1 is cold, it produces no voltage and has extremely high internal resistance. The internal resistance of the sensor is much greater than the resistance of the bias pull-up resistor. However, when the sensor heats up, it produces voltage that overrides the bias voltage. This voltage is read by the ECM to determine a rich/lean HO2S bank 1 sensor 1 signal used to adjust injector pulse width. Under normal conditions, low sensor voltage means high oxygen content/lean air-fuel mixture and vice versa. Normal sensor readings will fluctuate between 60 mV and 1080 mV. DTC P0130 will set if the HO2S bank 1 sensor 1 signal voltage indicates rich when the HO2S bank 1 sensor 2 signal voltage indicates lean; the HO2S bank 1 sensor 1 signal voltage indicates lean when the HO2S bank 1 sensor 2 signal voltage indicates rich; OR if the HO2S bank 1 sensor 1 signal voltage rises whenever the heater is being commanded Off for a certain number of times.

DTC PARAMETERS
DTC P0130 will set if HO2S bank 1 sensor 1 signal is between 60 mV and 400 mV with the HO2S bank 1 sensor 2 greater than 499 mV when:
^ Condition exists for longer than 10 seconds
^ Exhaust pipe moisture has evaporated (calculated engine run time between 0 and 30 seconds), then engine must run for longer than 80 seconds
^ Commanded air/fuel ratio is 14.7 to 1
^ EVAP leak diagnostics are not running
^ Calculated exhaust gas temperature is less than 800°C (1472°F)
^ Main relay voltage is greater than 10.5 volts
^ No EVAP purge solenoid or EVAP flow during non-purge DTCs have been set

OR

HO2S bank 1 sensor 1 signal is between 538 mV and 1080 mV with the HO2S bank 1 sensor 2 less than 104 mV when:
^ Condition exists for longer than 10 seconds
^ Exhaust pipe moisture has evaporated (calculated engine run time between 0 and 30 seconds), then engine must run for longer than 80 seconds
^ Commanded air/fuel ratio is 14.7 to 1
^ Calculated exhaust gas temperature is less than 800°C (1472°F)
^ Main relay voltage is greater than 10.5 volts

OR

HO2S bank 1 sensor 1 signal voltage rises whenever the heater circuit is being commanded Off when:
^ Condition exists for 16 out of 24 times the heater is being turned Off (heater is turned Off once every 10 seconds)
^ Exhaust pipe moisture has evaporated (calculated engine run time between 0 and 30 seconds), then engine must run for longer than 80 seconds
^ Commanded air/fuel ratio is 14.7 to 1
^ Calculated exhaust gas temperature is less than 800°C (1472°F)
^ Main relay voltage is greater than 10.5 volts

P0130 diagnostic runs continuously once the above conditions have been met.

P0130 is a type B DTC

DIAGNOSTIC AIDS

IMPORTANT: If an HO2S bank 1 sensor 1 or HO2S bank 1 sensor 2 low or high voltage circuit fault is also set, diagnose that DTC first.