P0175 on a Nissan: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Drivable for a short time, but a rich mixture wastes fuel and can damage the catalytic converter, so fix it soon.

What P0175 means on a Nissan

On a Nissan, P0175 means bank 2 is running rich — too much fuel or not enough air. It affects Nissan V6 models, since four-cylinder engines have only one bank. A failing mass air flow sensor is a well-known cause on Nissans.

Is P0175 common on Nissans?

P0175 shows up on Nissan V6 models like the Altima, Maxima, Pathfinder, and 350Z. The mass air flow sensor is a known wear item on Nissans and often triggers rich or lean codes as it ages. Bank 2 oxygen sensors and exhaust leaks are the other common causes.

Commonly reported on: Altima, Maxima, Pathfinder, 350Z.

Symptoms

Check engine light is on
Poor fuel economy
Strong fuel smell
Rough idle

Common causes

most common: Failing mass air flow sensor
common: Faulty bank 2 oxygen sensor
common: Exhaust leak ahead of the bank 2 sensor
less common: Leaking fuel injector on bank 2

How to fix it

Fix	DIY?	Typical cost
Clean or replace the mass air flow sensor	Yes	$10–250
Replace the bank 2 oxygen sensor	Yes	$60–200
Repair the exhaust leak ahead of the sensor	Mechanic	$100–300