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Honda Accord CO2 sensor

For the last few months my 2005 Honda Accord Euro auto has been using 12-13.5 L/100 km in city type driving whereas it was normally using around 8-9 L/100 km. I have replaced air filters; the Honda dealer has reset the computer a couple of times and recommended that I increase the tyre pressure to 36 psi. Other than that they don't seem to know what the problem is. The motor is running as smooth a silk, the only other thing I can think of is the CO2 sensor. What do you think?

Honda claimed an overall average of 9.2 L/100 km, but that's derived from a lab test and not real life. Even so it should be an indication of what you could expect, and that seems to be mirrored by your real life results. It would seem that it's probably running rich and your theory of a faulty CO2 sensor could be on the money. Your dealer should be able to check it and confirm if it's a problem or not.

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