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Honda Accord Air Fuel Ratio Sensor

Troubleshooting the Honda Accord Air Fuel Ratio Sensor

The air fuel ratio sensor is one of those parts Honda Accord owners don't even know they have in their car, but once they break down they certainly make their presence felt. Similar to that of the oxygen sensor, the air/fuel ratio sensor enables the car computer to measure fuel emissions more accurately which, in turn, leads to better fuel efficiency. So once the Honda Accord air fuel ratio sensor breaks down, both the fuel and emission efficiency of your vehicle will be severely affected. So if you notice that your Accord's is not running up to speed, follow these simple steps to determine if the air fuel ratio sensor is functioning normally.

Damaged electrical connections

A lot of air fuel ratio sensor problems can be sourced to faulty electrical connections. Check the electrical connectors in your Accord's sensor for dirt and grease and clean it if necessary. Also, check for cuts and other signs of damage on the wires. Make sure to keep the harness away from the exhaust as you do this to avoid damaging the connector and wires.

Carbon deposits

Over time, carbon from the fuel exhaust will start to accumulate around the air fuel ratio sensor. Using a ratchet fitted with a sensor removal socket, remove the sensor and check the tip. If the tip is coated with carbon deposits, replace it with a new one.

Voltage problems

If the air fuel ratio sensor and its electrical connections appear to be fine, check the voltage signal coming out of the sensor using a digital voltmeter. Hook the red probe of the voltmeter to the sensor signal wire and the black probe to the engine ground and turn on the ignition. Let the engine idle for two minutes while watching the digital display of the voltmeter. Ideally, the meter should display 0.1 or 0.2 volts for a short period, followed by fluctuations between 0.1 and 0.9 volts after two or three minutes. If the sensor takes four or more minutes to fluctuate, stays fixed at a particular voltage, or goes beyond 0.9 volts, it may have gone bad and needs replacing.

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  • Tips on Maintaining the Honda Accord Fuel Air Ratio Sensor 27 February 2013

    The air fuel ratio sensor is one of the parts of the Honda Accord that require regular maintenance, but a lot of Accord owners don't even know they have one in their vehicles. Mounted on the Accord's exhaust system, the air fuel ratio sensor helps the ECM measure the fuel emissions to better increase the engine's fuel efficiency. However, the constant high temperatures and toxic compounds from the exhaust can damage the sensor, eventually causing it to break down. With the following simple maintenance procedures, you can extend the life of the Honda Accord fuel air ratio sensor.


    Inspect the sensor regularly.

    Regular inspection of the fuel air ratio sensor is highly recommended especially after 30,000 miles of use (as most sensors tend to show signs of wear after reaching the 30,000-mile mark). Some of the things you need to look out for include dirty, greasy, or otherwise damaged electrical connections as well as carbon deposits at the sensor's tip.


    Clean the sensor once it gets dirty.

    If the fuel air ratio sensor gets particularly dirty, it will start to throw off the readings unless cleaned. First, lubricate the sensor and let it sit for 10 minutes before unplugging them. Place the sensor in a container, fill it with enough gas to cover all the parts of the sensor, and let it sit overnight. This will allow the gas to fully react with the dirt and deposits on the sensor. Dry the now-clean sensor with a paper towel and put it back on its mounting.


    Check the voltage.

    In addition, you should also check the voltage signal from the fuel air ratio sensor using a 10-megaohm digital voltmeter. Attach the red probe to the sensor signal wire and the black probe to the engine grounding, turn on the ignition, and let the engine idle for two minutes. The reading on the voltmeter should be fixed around 0.1 or 0.2 volts but fluctuate after two or three minutes between 0.1 and 0.9 volts. Take note of the lowest and highest voltage reading from the voltmeter in any one-minute period. If the sensor takes four minutes or more to fluctuate, stays fixed at a certain voltage, or if the voltage goes above the 0.1 or 0.9 range, replace the sensor as soon as possible.