P0137 on a Jeep: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

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

What P0137 means on a Jeep

On a Jeep, P0137 means the engine computer sees low voltage from the bank 1 downstream oxygen sensor behind the catalytic converter. This sensor only monitors converter efficiency, so low voltage usually means a faulty sensor, damaged wiring, or an exhaust leak — not a fuel-mixture issue. On V6 Jeeps, bank 1 is the right-hand bank.

Is P0137 common on Jeeps?

P0137 is common on higher-mileage Jeeps, and off-road use can add to it: mud and water in the sensor connectors, and trail damage to exhaust pipes, are regular triggers. Grand Cherokee and Wrangler models with V6 engines see it most.

Commonly reported on: Wrangler, Grand Cherokee, Cherokee, Compass.

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: Mud, water, or corrosion in the sensor connector
less common: Wiring damaged by heat or trail debris

How to fix it

Fix	DIY?	Typical cost
Replace the bank 1 downstream oxygen sensor	Yes	$70–250
Repair an exhaust leak near the sensor	Mechanic	$80–300
Clean or replace a corroded sensor connector	Yes	$20–80