P0175Medium urgency

System Too Rich (Bank 2)

Fuel System · Air/Fuel Mixture

⚠️ Causes poor fuel economy, fouled spark plugs, and eventual catalytic converter damage. Service within 1–2 weeks.

What this means

Bank 2 is running excessively rich — too much fuel relative to air. The ECU is pulling fuel (negative long-term fuel trim) to compensate but cannot bring the mixture to stoichiometric.

Likely causes

Stuck-open fuel injector on Bank 2Most common
Leaking fuel pressure regulatorMost common
Failing Bank 2 upstream O2 sensorCommon
High fuel pressure from faulty regulatorCommon

Estimated repair cost

Fuel injector cleaning/replacement$150 – $600

Fuel pressure regulator$100 – $350

O2 sensor$120 – $300

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Frequently asked questions about P0175

What does P0175 mean?

Bank 2 is running excessively rich — too much fuel relative to air. The ECU is pulling fuel (negative long-term fuel trim) to compensate but cannot bring the mixture to stoichiometric.

Is P0175 serious?

Causes poor fuel economy, fouled spark plugs, and eventual catalytic converter damage. Service within 1–2 weeks.

How much does it cost to fix P0175?

Repair costs for P0175 range from $150 – $600 depending on the root cause and your vehicle.

Can I drive with P0175?

You can drive short distances but should have it repaired within 1–2 weeks to prevent further damage.

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