One common cause of a p0171 or p0174 code is a dirty Mass Airflow Sensor. This article with pictures is meant to assist Honda Accord owners in cleaning the MAF.
The vehicle used in this article is a 2004 Honda Accord.
Tools and Materials Needed:
- Philips Screwdriver
- Mass Airflow Sensor Cleaner
- Hitachi Mass Airflow Sensor for Honda Accord (Hitachi MAF0033 Mass Air Flow Sensor)
Start by popping the hood.
Locate the Mass Airflow Sensor near the Air Filter, this will be near the battery.
Press the plastic clip to release the connector, and pull it away from the MAF.
Use a Philips screwdriver to remove the 2 screws.
Carefully remove the MAF.
Locate the sensors, they almost look like little resistors. If they appear contaminated, spray them off with Mass Airflow Sensor Cleaner.
Be sure to check the ones on the bottom as well.
The ones in these photos appear pretty clean. If they appear contaminated with what looks like dust and soot, spray them with the cleaner.
Then let the MAF dry for a few minutes before re-inserting it into the slot.
Tighten the screws, and you are finished.
If the error codes persist, and you need to replace the MAF altogether, check out the link below for the part number.