⚡ AUTO CODE FIX
🔍
Fuel SystemModerate✅ DIY Friendly

P0173

Fuel Trim Malfunction Bank 2

Fuel trim on Bank 2 is out of range.

SeverityModerate
CategoryFuel System
Est. Repair Cost$50–$400
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

⚠️ Symptoms

✅ How to Fix — Step by Step

  • Step 1:Smoke test Bank 2 intake
  • Step 2:Check MAF sensor
  • Step 3:Test Bank 2 O2 sensor
  • Step 4:Check fuel pressure
💡 Pro Tip: Compare Bank 1 and Bank 2 fuel trims to isolate whether the issue is global or bank-specific.

Repair Cost Estimate

Full Repair Estimate
$50–$400
DIY Possible?
YES
Severity
Moderate

Frequently Asked Questions

What does OBD2 code P0173 mean?+
P0173 stands for Fuel Trim Malfunction Bank 2. Fuel trim on Bank 2 is out of range.
What causes code P0173?+
Vacuum leak Bank 2 side; MAF sensor issue; O2 sensor fault Bank 2; Fuel delivery issue
How do I fix code P0173?+
Smoke test Bank 2 intake; Check MAF sensor; Test Bank 2 O2 sensor; Check fuel pressure
How much does it cost to fix P0173?+
Estimated repair cost for P0173 is $50–$400.
Is P0173 DIY-friendly?+
Yes — P0173 is generally DIY-friendly with basic tools.

AI Diagnosis

Related Codes

P0170Fuel Trim Malfunction Bank 1
ModerateDIY
P0171System Too Lean Bank 1
ModerateDIY
P0172System Too Rich Bank 1
ModerateDIY
P0174System Too Lean Bank 2
ModerateDIY
P0175System Too Rich Bank 2
ModerateDIY
P0180Fuel Temperature Sensor A Circuit
ModerateDIY