P0137 on a Volvo: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

Safe to drive — this downstream sensor only monitors the catalytic converter, so a Volvo with P0137 can be driven while you arrange the repair.

What P0137 means on a Volvo

On a Volvo, P0137 means the engine computer sees low voltage from the bank 1 downstream oxygen sensor, the one after the catalytic converter. This sensor only checks converter efficiency, so low voltage usually means a faulty sensor, damaged wiring, or an exhaust leak rather than a fuel problem.

Is P0137 common on Volvos?

P0137 is seen most often on higher-mileage Volvos as the post-cat sensor ages. Older five-cylinder models like the S60 and V60 are common candidates, and small exhaust leaks before the sensor can produce the same code.

Commonly reported on: XC60, XC90, S60, V60.

Symptoms

Check engine light on
Usually no change in how it drives
Possible exhaust tick from a small leak
Slightly worse fuel economy if a leak is present

Common causes

most common: Faulty bank 1 downstream oxygen sensor
common: Exhaust leak before the downstream sensor
common: Sensor wiring damaged by exhaust heat
less common: Corroded sensor connector

How to fix it

Fix	DIY?	Typical cost
Replace the bank 1 downstream oxygen sensor	Yes	$80–280
Repair an exhaust leak near the sensor	Mechanic	$90–320
Repair damaged O2 sensor wiring	Mechanic	$80–250