They're upselling you run a can of seafoam through then clean the o2 sensor

 

sadly....it doesnt seem like that..

 

Worked for me on my 2016, I keep plugs and fluid fresh too have a friend thats been a tech at the Honda dealership for decades, shows me all the tricks to keep them running smooth.

 

There is also an air fuel sensor up top on manifold clean that baby too I suggest investing in the tool they sell them at Harbor Freight as they need cleaned pretty often the dealership is giving you the runaround all it is

 

can you put the air fuel sensor up top the manifold in the dishwasher? usually the dishes are pretty squeaky clean when i take them out and some of them can be quite greasy and carbon-ed up (wifes not the best cook...enough said)..

 

Hi folks,

I have 2016'FIT EX (for now the mileage near 35k). on 25k I've took P0304 (No. 4 Cylinder Misfire). For about six months I diagnosed this error in different service centers.
For now I have additionally P219A error.
As described above it's a Honda fault...

So my question is - can I change just one injector in 4-th cylinder (I can order it in Japan separately 16010-5R1-315) or need to change the whole Injector Set because of defect of old injectors?

 

I doubt that will solve the problem. I hate to say it, but I would bring the car to a dealer and see what he says. Unfortunately, they tend to offer a "solution" costing over $1,000 for almost any problem. Do lots of research online before you pay any more people. I would do the research before going to a dealer.

For example -
https://www.carparts.com/blog/p0304-...fire-detected/
https://www.engine-codes.com/p0304_honda.html

And -
https://www.obd-codes.com/p219a
https://partsavatar.ca/p219a-obd-ii-...or-fuel-filter

 

Thx for the links SilverEX15 I'll check it

 

There are lots of articles. Ask around for a good Honda mechanic - an independent.

 

according to my notes:

• firstly sparked P0304
• after that P1454 (Evaporative System Vacuum Test Malfunction)

I've made a lot of diagnosis i.e. changed spark plugs, swapped ignition coil, checked EGR sensor, adjusted the valves, flushed the injector with a special fuel additive - with no results... (BTW after flushing injectors was no errors about 2k miles).

so there is only one thing - change the injector(s)...

Since I've changed Evaporative System Valve I have just two errors - P0304 and P219A. Dealers recommended just one solution - is to change Injectors Set - and it's frustrating...

 

One warning about changing emissions parts. The car can tell if you use non-Honda parts, and the codes will remain. I bought a $30 mass flow sensor - no good. I had to spend almost $300 for the Honda MAF for the code to stay cleared. The MAF from Advance Auto Parts had a warranty, but that warranty ended as soon as I used it. Fantastic!

 

AFAIK, unless you're buying used, can't buy just one injector. Have to purchase new ones in quad-matched sets.

Herein lies the problem. Even if you replace the injector(s) and get it running again, there is no guarantee this won't happen again. I think the entire rail / injector assembly is suspect from a design standpoint. Replacing parts of a suspect system with other parts is only a short-term solution at best. This is why I don't recommend the GK5 anymore. Nobody wants to spend $2-3K out of pocket for injectors. I sure don't.

 

Yeah - it's a sad story..

I have opportunity to buy brand new Honda injector separately (from Japan) but I won't- i'll replace it by set...

 

The fuel injector replacement is covered in Honda Service Bulletin #18-027 (March 2018). Note that they also call for replacing the Fuel Joint Pipe Set and the Throttle Body Gasket.

Honda Service Bulletin #18-027

 

I'm hearing some reports of people getting their fuel injectors done and their Fit still running roughly or even stalling, throwing a code.

I've also heard more than a few people mention their independent mechanics claiming it was a throttle body SENSOR for fuel to air ratio within the throttle body, NOT THE MAF OR MAP SENSOR, which was the cause of the PO420 or p0421 code (and poor cold performance) Rather than the (catalytic converter) with the injectors as the original source.

​​​​​​Can someone refresh my memory I can't find the name of that sensor anywhere.

If it's not the injectors in some instances could it be the sensor? Honda recommends to replace the entire throttle body if this sensor is bad or needs cleaning. Please somebody help me with the name of it. Or does somebody have schematics of the throttle body for 2008 and/or 2nd gen as well?

 

You can rely on Honda to try the most expensive repair first. We went through that with my son's 2015, but they didn't do the injectors. They even thought an oil change was necessary! If you need any parts related to emissions, like the mass airflow sensor, you have to use the Honda part. I replaced the MAF on my son's car with a $30 part from Autozone. The code reappeared. A mechanic told me that I have to use Honda parts for emissions because the computer knows!

 

Hmmm,

After I've replaced injectors, the P219A and P0304 is gone, but for now I have P0420.
There is a suspicion that there is a small hole in the exhaust system.
This error pops up at low speeds and at low load.
I know that there are people who changed the catalyst with a sensor completely, but in the end it did not help them ...

Now I'm dealing with this

 

This is what I found: "P0420 is telling you that the catalytic converter is not working as efficiently as it should. It uses the output of the upstream and the downstream oxygen sensors to determine the efficiency. It could be that the catalytic converter is truly damaged and is not converting the NOx as effectively as it should.Aug 25, 2020"