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P2240 HONDA

P2240 HONDA - Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 IP Line High Voltage

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3   
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Possible causes

  • Air/Fuel Ratio Sensor Bank 2 Sensor 1 harness is open or shorted
  • Air/Fuel Ratio Sensor Bank 2 Sensor 1 circuit poor electrical connection
  • Faulty Air/Fuel Ratio Bank 2 Sensor 1
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks

Tech notes

For the following Honda models:

2003–2005 Honda Accord V6s
2005 Honda Odysseys
2005 Honda Pilots
2006 Honda Ridgelines

To fix this problem, check the sensor wiring and connections for damage. If the sensor circuit is OK, and the DTC(s) come back after clearing them and doing a short test-drive, replace the A/F sensor. The replacement A/F sensors in Honda parts stock are an improved version over the original sensor.

When is the code detected?

If the IPB 2 terminal voltage is out of a specified range, the PCM detects a malfunction and stores a DTC.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

P2240 Honda Description

The Air-Fuel ratio (A/F) sensor provides output voltage approximately equal to the existing air-fuel ratio.

The A/F sensor output voltage is used to provide feedback for the Engine Control Module (ECM) to control the air-fuel ratio.

With the A/F sensor output, the ECM can determine deviation from the stoichiometric air-fuel ratio and control proper injection time. If the A/F sensor is malfunctioning, the ECM is unable to accurately control air-fuel ratio.

The A/F sensor is equipped with a heater which heats the zirconia element. The heater is also controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), current flows to the heater which heats the sensor to facilitate detection of accurate oxygen concentration.

The A/F sensor is a planar type. Compared to a conventional type, the sensor and heater portions are narrower. Because the heat of the heater is conducted through the alumina to zirconia (of the sensor portion), sensor activation is accelerated.

The code is output when there is an open or short in the A/F sensor circuit, or if A/F sensor output drops. To detect these problems, the voltage of the A/F sensor is monitored when turning the ignition switch to the ON position, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the A/F sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is outside of the specified range, or the admittance is less than the standard value, the ECM will determine that there is a malfunction in the A/F sensor. If the same malfunction is detected in the next driving cycle, the MIL is illuminated and a DTC is set.

OBDII Code P2240 Honda - Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 IP Line High Voltage - AutoCodes.com

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