My CEL light came on yesterday (4/3) and three codes popped up on my OBDII reader, P2A00, P1172, and P0456 (which I can't ID). In any event, I believe it is my #1 O2, (Air/Fule sensor). My issue here is, I just replaced this, about the same time last year, so it is barley a year old. I purchased a genuine Honda OEM sensor, and am not sure why it would go again. The sensor I bought is part number 36531-RME-A01 from www.bkhondaparts.com. I did some research and read that I need to get my software updated? Is this the case, can an O2 sensor fail within 1 year of installation if the software is not updated? Dose anyone konw if Honda will perform the software update for free?

I have a 2008 honda Fit manual transmission with 65K.

Thanks in advance-

 

I would clear the codes and remove the battery cable to erase random access memory, before buying any thing. I have cleared 3 codes on my dads car and did the battery thing and no more problems. Season changes in gasoline can confuse the O2 too. I am seeing that in my Civic.

 

Honda should do a software update for free but I dont think there was a software update for the 2008, just the 2009 and maybe early 2010.

 

I wasn't sure about the software update, and Honda didnt' say anything to me the last time around.
The funny thing is, right before the check engine light came on, my odometer was saying "check gas cap", so I pulled over and checked it out, everything was ok. Then my check engine light showed up. How do you clear the codes? I tried erasing them with my OBDII reader, but had no luck? I will try the batter cable removal tomorrow.

 

You should be able to use the OBD2 reader to erase the codes. You do that with the engine off but key turned on. Theres a limit on how far the fuel trims and timing go to correct for bad gas, season changes before it throws a code. You might of not needed a new O2 to begin with and replace it with a uncompilable O2. O2 sensors should last to around 100000 miles especially with the new low sulfur oils and fuels. Removing the battery cable off the positive will erase the fuel trims and rebuild them as you drive and thats in the owners manual. Hope this helps and welcome to Fit freak.

 

......And stop putting in gas from those shady gas stations!

 

• P0456 = EVAP System: Very small leak detected. Such leaks are hard to find without special equipment. Could be a bad hose.
• Short & long fuel trim will remain at 0% as long as P2A00 or P1172 are set; the engine is running open loop.
• Try packing the sensor-to-ECM connector with dielectric grease. Most likely you have a poor connection.
• Get the software re-flash as a last resort. It won't be free ($100-$150) and I doubt if it clears the problem. A Honda dealer won't attempt to clear P2A00/P1172 unless they change the AF sensor. They will insist upon it. Labor + part ≈ $250. (Book time=0.70 hour.)

 

Thanks for the info.

I was able to clear the P1172 and P2A00, however the P0146 keeps coming up. I reset the ECU (removed negative cable from battery for 15min and erased the code w/ OBDII reader) which lasted for about 100 miles then the check gas cap waring came on twice, followed by the check engine light w/ the P0146 code. I tried getting an inspection sticker, but was only given a 60 day temp sticker, in which they said the OBDII reader could not read the ECU as the battery must have been disconnected.

I guess I will try dielectric grease, but I am not sure what else to try. Is there a vent hole which could be clogged near my gas cap? I have heard of this being an issue in the past. I can't imagine my new O2 sensor is gone.

 

I went to Honda today to see if they could tell me why my check engine light keeps coming one, to make a long story short, they wanted $98 just to look at it, needless to say I left.

I have had no luck with determining why my check gas cap, and then check engine light keep coming on? Any input would be greatly appreciated.

 

Replace the gas cap. Didn't you put a different o2 sensor on? There is different ecu protocols and you threw the wrong one on. It doesn't recognize the o2 and might wreck the others.

http://en.wikipedia.org/wiki/Engine_control_unit

 

I didn't put a new O2 in yet, however the one I am currently using is less than a year old. I didn't want to spend $200 on a new sensor and find out it is something else. The P1172 and P2A00 code no longer show up, it is the P0426 code that keeps showing up. I think the P0426 code is a default code for the OBII reader I have, which is O2 sensor?

I wasn't sure if anyone else on here has had this same issue. I would think that if my O2 sensor is bad, then there is probalby something else wrong with the car, seeing as how this would be the 3rd O2 in two years.

 

I just remember a post a while back about you changing a o2 and it didn't work. Was the sensor in the Cat? This is what I found OBDII Code P0420 HONDA - Catalyst System Efficiency Below Threshold (Bank 1) | Engine-Codes.com. The six does not make sense but it probably because the wrong sensor was installed.

 

I did mention something about that, which may have been a little confusing. I changed out the O2 about a year ago, during which the CEL never came on. The CEL decided to come on about a month ago, at which point I put the old O2 back in, and realized the car ran like crap, so I put the "newer" O2 back in during which the CEL never cleared. The thing that is confusing me this time around, is the fact that my "check gas cap" waring pop's up when I clear the codes and reset the ECU. This did not happen the first time around when the O2 was actually gone. I replaced my A/F sensor which I guess is refered to as the pre-cat? so it is the O2 on my down pipe before the Cat.

I am at a loss at this point. I really don't feel like bringing my car to Honda (no offense for anyone who works there) it is just too expensive, and they try to upsell everything.

I do appreciate all of the feedback.

 

I think the ecu might be gone and is wrecking the sensors. All those codes go to the emissions and not even for Honda Honda OBD-II Engine Codes | Engine-Codes.com . Good luck but if you are under 80000 miles it should be covered except sensors. http://www.factorywarrantylist.com/u...9_warranty.pdf
http://www.epa.gov/oms/consumer/warr95fs.txt

 

Ok, so I think I figured out the issue.

The P2A00 and P1172 are gone, and have not come back since I cleared them (makes sense with the whole bad gas issue). The other code, P0456 EVAP leak - Small, I am not sure what this could be, however at this point I am under the impression I need to bring the car to Honda for a vacuum test? Has anyone had this issue before? I know this is a general question, but what could the possible problems be, and how much $$$ am I looking at.

 

Replace the gas cap. Reset the ECU with your OBD scan tool. Post back up if it comes back on.


If I see 100 cars with that code, 97 of them I cure by advising the driver to turn the car off before refueling. 2 of them I cure by replacing the gas cap. The 1 out of that 100 that's left requires some actual time and effort.

 

KyleB

Thanks for the advice, and I will try a new OEM gas cap before anything.

I should have mentioned, I live on a dirt road and noticed that the black box above my drivers side rear tire was full of dust and dirt. This is where the lines for the gas filler feed through. I am not sure if there is some type of valve that may of been frozen shut due to dirt or dust? In any event, a gas cap is affordable enough to try.

I'll re-post w/ my findings.

 

More than likely you're looking at the EVAP system leak detection pump. Back in the good 'ol days, the manufactures would alleviate the pressure that naturally builds in a fuel tank by venting it directly into the atmosphere. Well, we figured out that maybe that isn't such a good idea. Now, those vapors are reintroduced into the intake tract to become part of the combustion process.

The pump basically pumps pressure into the fuel tank every few ignition cycles. After a certain pressure is achieved, the system then looks to see that the pressure stays constant. If it does, you're good and you don't have an EVAP system leak. If the pressure drops, the system detects an EVAP system leak and turns your check engine light on. The usual culprit is either a) someone refueling with the engine on, or b) a worn out seal on the gas cap.

good luck, hope the gas cap solves the problem for you!

 

According to internet P0426 is a code for cat temp inefficient. If thats the case erase the cose and drive 10-15 miles in third gear to 'eat' the catalyst and the code may not reappear. If it does there is a cat problem.
I couldn't find P0426 in my Honda shop manual but then its difficult because you have to go to each component section and not a single list.

 

I just wanted to follow up on this thread, incase anyone down the road has this same issue.

I ended up going to Honda, they found that a rodent had chewed through one of my EVAP hoses on top of my gas tank (I would have never found this). They wanted to charge me $790 dollars and have the entire EVAP system replaced, I found this to be a little redundant, as it is a simple hose. Long story short, I purchased the 2007-2008 Helms manual and plan to tackle this on my own.

My question is, do I need the fuel Sender Wrench part# 07AAA-S0XA100 in order to drop the gas tank?

Has anyone tried this on their own, it dose not seem like a complicated project?