Fuel lean code P0171?

Hi,

The code is specific to a lean fuel mixture specific to bank 1. If there was an issue with the fuel tank capless system, it wouldn't be limited to only one side of the engine.

So, by chance have you noticed an exhaust leak on the one side of the engine near the exhaust manifold (pre-catalytic converter)? What do you do that causes the light to go off for a few days? You mentioned a cover. Which cover are you referring to? Does the vehicle seem to run properly? Have you ever noticed a misfire?

We could have a failing fuel injector, fuel pressure-related issue, exhaust leak, vacuum leak, and so on, so I'm trying to narrow things down.

Please keep in mind, if this is an emissions-related issue, and it sounds that way, it may be covered under the emissions systems new vehicle warranty for up to 8 years or 100K miles based on the cause and where you are located.

Let me know.

Joe

I haven’t noticed a misfire, and the cover for the gas tank that is spring loaded, I figured if I had air getting into my fuel system then that’d be the first spot to check. And what are some ways to find an exhaust leak? Is it more or less the same way to find a vacuum leak?

Hi,

If there is an exhaust leak, usually it will be something you hear. It may even sound like a ticking. Often, people use something like carburetor cleaner to locate an engine vacuum leak. Don't spray that on the exhaust. It could cause a fire.

Here are two links you may find helpful:

https://www.2carpros.com/articles/step-by-step-guide-how-to-check-for-an-automotive-exhaust-leak

Here is a link that explains how to locate a vacuum leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know if it helps.

Next, by any chance do you have access to a live data scan tool? If you do, let me know what the short-term fuel trims are.

Let me know.

Joe