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Old 11-12-2013, 02:52 PM
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I have 2003 acura rsx type s and a engine code code came up as system to lean bank 1 p0171

Ive have smelled alot of gas lately and it gets worse and worse I personally think its a fuel injector or a o2 sensor

What do you think ?
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Old 11-12-2013, 02:56 PM
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A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor

If you are "leaning out", and you started smelling fuel, you prob have a fuel leak, that is causing the lean conditions the code is being thrown for.
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Old 11-12-2013, 04:12 PM
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You can smell gas but you have a code for a lean condition. That eliminates a lot of the major players, because you've got a code that is telling you something that clearly conflicts with what you're seeing.

It's possible that you have a fuel leak, causing the system pressure to be too low, etc. That would be a pretty visible thing to check out, and you should see raw fuel somewhere in or around the engine, or be able to pinpoint the smell with the engine off if the leak is more hidden.

The more common occurance for that code is that the O2 sensor is bad, or that you have an exhaust leak. Both of those things can give the same results. In one case, the O2 sensor is bad and is giving a false reading to the ECU. In the other case, the exhaust leak is fooling a perfectly functional O2 sensor, which again gives a false reading to the ECU.

There are other possibilities, but the ones listed are the common and most likely ones. If you didn't smell gas, and just had bad fuel economy or whatever, I'd possibly expand the list to include some other things.
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