klemmaniac

I recently took my Fit on a rough mountain road that I thought wouldn't be as rough as it was and hit the undercarriage on a large-ish rock trying to clear it (the car plopped down on it and I heard a bang).

Now the engine light is on and the code pulled is P0171:

Powertrain System
produced primary trouble code:

P0171 System Too Lean (Bank1)

Looking up other posts I found the quoted suggestion above of possible causes for this code and was wondering does anyone have any idea which one would be most likely given the scenario mentioned above?

Other info: I'm not sure where on the undercarriage the rock hit, just that it is probably between the exhaust pipe and the front bumper, so anything in between. The code was pulled from a scanner from Autozone.
The car drives fine with no noticeable issues. Visual inspection of the undercarriage revealed no damage that I can see (just leaned under with a flash light and checked)

Klasse

Too lean isn't good for the engine. Is it leaking fuel underneath?

klemmaniac

I didn't see that when I checked under the car, but should I look out for fuel on the ground now that it's parked? I'll check and if I see anything let you know. If there isn't fuel leaking, would that narrow down the cause to something else in particular?

klemmaniac

I also posted this on fit freak and someone made a very sensible suggestion that the hit could have banged up the tail/exhaust pipe since it goes a long way under the car. My only other suspicion is that I have a K&N filter that could have been knocked loose. I'm going to check things out now thoroughly today but any opinions are welcome.

Klasse

I'm not an expert but would check you haven't damaged a fuel line, check with the engine running or at least when the pump is primed when you turn the key on. Might not be a huge amount but it's not good obviously. Also in exhaust it may have hit the oxygen sensor somehow which reads how lean/rich the gas is.

tech8

You need to include the model year.

claymore

Look at the oxygen sensor located in the exhaust pipe. Damage to that would cause the Code. And it is on the lower section underneath the body of the car.

klemmaniac

Thanks I'll check it out.

But update:. There is a little hose with an open end underneath the air intake(my k&n filter) that had gunk clogging it up at the open end. I cleared that and the engine light went off, so maybe that was it? Have no idea what that hose is.


Other than that car drives great, fuel consumption is normal with expected mpg, no fuel leaking under the car.... This is not the first time I've gone of road with my Fit and remain impressed at what a little tank the car is.

and to answer the other question it is a 2009 fit sport