P0175

System Too Rich (Bank 2)

OBD-II diagnostic trouble code P0175indicates a fault detected by the vehicle's onboard computer. This code applies to all OBD-II compliant vehicles and should be addressed promptly to avoid potential engine or emissions system damage.

Severity Level 3 — Moderate

This code indicates a moderate issue that may affect vehicle performance and fuel economy. Continued driving is possible in most cases, but prompt diagnosis and repair are recommended to prevent further damage.

Common Symptoms

• Check Engine Light on
• Black smoke and strong fuel smell from exhaust (Bank 2 side)
• Poor fuel economy
• Rough idle, may stall at stop lights
• Spark plug fouling on Bank 2 cylinders (black soot)

Possible Causes

• Faulty MAF sensor (if both banks rich, MAF is likely cause)
• Leaking Bank 2 fuel injector(s)
• Faulty Bank 2 upstream O2 sensor sending false rich or stuck signal
• Excessive fuel pressure from failed pressure regulator
• Restricted air intake or dirty air filter
• EVAP purge valve stuck open

Common Fixes

• Clean or replace MAF sensor ($10-400)
• Replace leaking Bank 2 fuel injector(s) ($200-800)
• Replace Bank 2 upstream O2 sensor ($80-300)
• Replace fuel pressure regulator ($80-300)
• Replace air filter ($15-40)

Estimated Repair Cost

These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.

Explore Repair Costs

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