jerryc41 Loc: Catskill Mts of NY

Have any of you had experience with Check Engine code P0171? It indicates a lean mixture. My son's 2015 Honda Fit (84,000 miles) has this problem, and he can't get it inspected. The dealer cleaned the Mass Air Flow Sensor, but the light came back on. Then they did a $300 oil change and fuel system cleaning - light came back on. Now they want to replace the injectors for $1,700. They seem to be playing a guessing game that he's paying for.

I'm wondering if any of you found a solution the that error code.

Bill MN Loc: Western MN

Trade it in for a Honda Civic

JimBart Loc: Western Michigan

Had a similar problem with my corvette. It turns out that after replacing the MAF one of the connecting pins in the wiring harness to the MAF was bent. Replaced the harness and the code disappeared
Hope this might help.
Also are his air filters clean or dirty?

Bill MN Loc: Western MN

I had a code something about gas, tried a new gas cap that fixed it. Use manufactures parts.

jerryc41 Loc: Catskill Mts of NY

Clean

jerryc41 Loc: Catskill Mts of NY

Yes, I've heard that if I don't use Honda parts, I'll get error codes.

Indi Loc: L. I., NY, Palm Beach Cty when it's cold.

You might be able to temporarily disable the error code and light. Disconnect the battery cable for an hour before you go for the inspection. You’d have to do this right outside the inspection station and hope it doesn’t come back on in the middle of it. It WILL come back on after a while.

Try another dealer.

wingclui44 Loc: CT USA

Let me tell you my story of the "Check engine" of my 2013 Subaru Forester. Last year on November some day morning, I started my car getting to go shopping, I saw the "Check engine " plus two other warning light showed up on the dash, I didn't believed my reliable SUV would give me this kind of trouble, I had this car checking up and service every year by the original dealer. I didn't want to take risk to my car and safety of myself, so I called road service to take it to the dealer 12 miles away. they found that the gas filer cap was loose, that will cause the Warning lights to show. That costed me hundred something dollar to tighten the cap. They said it's in the owner's manual. Yes, it is, and it was my fault not to tighten the cap after filling gas day before! After that I started reading the manual at every page and make sure I didn't miss any thing!

GeneS Loc: Glendale,AZ

Jerry
Hope this link works for you https://www.google.com/search?source=hp&ei=PdmSW77KMJDS8AOSrovABQ&q=honda+check+engine+code+p0171&oq=+Check+Engine+code+P0171&gs_l=psy-ab.1.7.0l3j0i22i30l7.2828.2828..16615...0.0..0.85.159.2......0....1j2..gws-wiz.....0.fIieE6aTwMc

It tells you a number of things that might be bad, the MAF, vacuum hose leak, head gasket. Don't see any thing on injectors, but fuel filter could be bad

jerryc41 Loc: Catskill Mts of NY

I have a code reader than can reset it, but then the car has to be driven through a specific cycle of three cold starts before it can be tested again. The first time I brought the car, I reset the light about a mile from the inspection station. They weren't able to inspect it because the car wasn't ready.

jerryc41 Loc: Catskill Mts of NY

That's a killer, isn't it? The dealer charges the diagnostic fee rather than checking the gas cap. Unfortunately, the gas cap wasn't the problem with this car. Now my son will have to drive it uninspected till at least Monday.

jerryc41 Loc: Catskill Mts of NY

Thanks. I found things like that, too. On their first attempt, the dealer cleaned the MAF. Rather than check for vacuum leaks, they went straight to the $300 injector cleaning. I believe the fuel filter is in the tank, and it's not easy to access. With a labor charge of $129 plus tax, nothing is cheap.

I'm going to try a good independent mechanic on Monday.

wingclui44 Loc: CT USA

Yes, they charged labor cost, $129. and change, fortunately I have the membership with the road-side service, that saved me a lot. The Subaru company should make a independent warning specially for this "gas cap" problem, why does it relay to the engine anyway? I know this is a safety issue!

EX-TELCO Loc: Belen,New Mexico

Jerry you may want to replace the Oxygen sensors.

cochese

I worked for many years as a mechanic. Couple things I would do before changing injectors. If it has an external from the tank fuel filter, change it. Back when all fuel filters were external 90% of lean codes were caused by a plugged fuel filter. Next have a fuel pressure test performed along with an extensive test for vacuum leaks. A failing fuel pump or fuel pressure regulator could be the culprit. Also voltages on the offending O2 sensor should be checked to be sure the engine is actually !ean. As an aside I rarely saw injectors fail. Not sure who or how competent your mechanic is, but simply changing parts, and expensive ones at that, and hoping it gets fixed is not the answer. Properly testing the system to diagnose the problem is. When cars first started using computer controls we did not have fancy code readers. We had volt meters and pressure/vacuum gauges along with a testing flow chart. Diagnosis was involved, sometimes tedious... But when I told you what needed replaced you could be guaranteed it would solve the problem.

P.S. My mechanical tenure was in the 90's to early 2000's at which time I was an ASE certified master tech. I still work on my own and families but not professionally.