P0133 on a Nissan: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

A Nissan with P0133 usually still drives fine, but fuel economy may drop a little until the sensor is replaced.

What P0133 means on a Nissan

On a Nissan, P0133 means the bank 1 upstream sensor is responding too slowly. Many Nissans use a wide-range air-fuel ratio sensor instead of a plain oxygen sensor, and it plays the same role of keeping the fuel mixture correct.

Is P0133 common on Nissans?

P0133 is common on Nissans like the Altima, Sentra, and Rogue as they age. The A/F sensor wears with mileage, and an exhaust leak at the flex pipe is a frequent extra cause on these cars.

Commonly reported on: Altima, Sentra, Rogue, Pathfinder.

Symptoms

Check engine light on
Lower fuel economy
Rough idle or hesitation
Failed emissions test

Common causes

most common: Aging air-fuel ratio sensor (bank 1, sensor 1)
common: Exhaust leak before the sensor
common: Sensor contamination from oil or coolant
less common: Wiring or connector damage

How to fix it

Fix	DIY?	Typical cost
Inspect the exhaust for leaks near the sensor	Yes	$50–150
Replace the upstream A/F sensor	Yes	$120–300
Repair the sensor wiring if damaged	Mechanic	$100–250