← View Generic P0173 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0173: P0173: Fuel Trim Malfunction (Bank 1)

on 2021 Honda PASSPORT

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
2021 Honda
PASSPORT
⚠️

Important for 2021 Honda PASSPORT Owners

Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0173 Mean on 2021 Honda PASSPORT?

The engine computer has detected a fuel trim malfunction on bank 1, indicating a lean condition. This can be caused by a variety of issues, including a vacuum leak, faulty oxygen sensor, or clogged fuel filter.
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Symptoms

  • • Rough idle
  • • decreased power
  • • poor fuel economy
  • • and a check engine light
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Common Causes

  • • Vacuum leak
  • • faulty oxygen sensor
  • • clogged fuel filter
  • • dirty or clogged fuel injectors
  • • faulty fuel pressure regulator
  • • or a malfunctioning fuel pump
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How to Fix P0173 on 2021 Honda PASSPORT

1. Check for vacuum leaks and repair as necessary. 2. Replace the oxygen sensor if faulty. 3. Clean or replace the fuel filter. 4. Check and clean fuel injectors. 5. Check fuel pressure and replace the fuel pressure regulator if necessary. 6. Check the fuel pump and replace if necessary.

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Need Maintenance Info for Your PASSPORT?

Get oil capacity, filter specs, and torque settings for your specific 2021 Honda PASSPORT.

View 2021 Honda PASSPORT Specs

Parts for 2021 Honda PASSPORT

oxygen sensor Shop ↗ fuel filter Shop ↗ fuel injectors Shop ↗ fuel pressure regulator Shop ↗ fuel pump Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2021 Honda PASSPORT

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Related Diagnostic Codes

Other codes that may appear with P0173

P0171 Sequential Code

System Too Lean Bank 1

Medium
P0172 Sequential Code

System Too Rich Bank 1

Medium
P0174 Sequential Code

System Too Lean Bank 2

Medium
P0175 Sequential Code

System Too Rich Bank 2

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system