My wife’s fit got this code today. Bank 1 sensor 1 fuel system too rich. Hard shifting may be a symptom of this code. I ordered a new air/fuel sensor and a new mass air flow sensor. Anyone else ever have this issue?
Honda P0172
- Thread starter Bettez88
- Start date
Actually got a P0171 earlier this week on our Honda.
No obvious air leaks, maf seems perfectly fine, spent the better part of 2 hours checking hoses for air leaks, spraying starter fluid, blocking off small air lines with pliers, didn't do much.
Also noticed 24% ltft and 46% stft at 2.5k rpm so I'm at about to measure fuel pressure.
Sorry not trying to high jack tread just similar issue
No obvious air leaks, maf seems perfectly fine, spent the better part of 2 hours checking hoses for air leaks, spraying starter fluid, blocking off small air lines with pliers, didn't do much.
Also noticed 24% ltft and 46% stft at 2.5k rpm so I'm at about to measure fuel pressure.
Sorry not trying to high jack tread just similar issue
Exhaust leaks can also add to the problem. When cold, I hook a vacuum in reverse at the tail pipe. I used bubble soap at the joints.
Did you try cleaning the maf sensor first?
Rich code is most often A/F sensor or the MAF sensor. My experience is its usually the A/F sensor because if the MAF sensor is fubar it typically throws a MAF code also - at least most Nissan's do.
The lean side is most often a vacuum or exhaust leak.
But weird places in between do occur.
The lean side is most often a vacuum or exhaust leak.
But weird places in between do occur.
Along with the above, I would also check the upstream O2 sensors live data and make sure it is switching fast not slow.
I ordered a new Denso A/F sensor and a new Hitachi MAF sensor. I also changed the aftermarket air filter to an OEM Honda one and cleared the code. Has come back yet
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