P0175 — System Too Rich (Bank 2)

P0175 is the bank 2 version of a rich fuel condition — the ECM is cutting fuel and still reading rich. If P0172 is also present, look for a cause shared by both banks like the MAF or fuel pressure.

Cost range: $50–$900. Severity: medium. Safe to drive? Short term yes. Prolonged rich running kills catalytic converters.

Most common causes of P0175

1. Dirty MAF sensor — A single MAF fault affects both banks — check for P0172 alongside. ($20–$400)
2. High fuel pressure — Failed regulator or restricted return line. ($150–$450)
3. Leaking injector on bank 2 — Isolate with a balance test. ($200–$700)
4. Contaminated engine oil — Fuel-diluted oil off-gasses through the PCV system. ($60–$150)

Symptoms drivers report with P0175

• Black smoke
• Fuel smell
• Rough running
• Poor economy