P0137 2017 Honda CR-V Code - Secondary Heated Oxygen Sensor 2 Circuit Low Voltage

P0137 indicates that the Secondary Heated Oxygen Sensor 2 (downstream sensor) has a low voltage output, which suggests the sensor may not be detecting sufficient oxygen levels in the exhaust.

Common symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, or the vehicle failing an emissions test.

Possible causes include a faulty downstream oxygen sensor, damaged wiring or connectors, a malfunctioning catalytic converter, or an exhaust system leak.

While the vehicle may still be drivable, ignoring the code could lead to reduced fuel efficiency, increased emissions, or damage to the catalytic converter over time.

Repairs may include replacing the downstream oxygen sensor, repairing or replacing damaged wiring, fixing exhaust leaks, or addressing catalytic converter issues.

You can use a multimeter to check the voltage output of the downstream oxygen sensor. It should generally fluctuate between 0.1V and 0.9V under normal conditions.

You'll need an OBDII scanner, a multimeter, and possibly a jack and wrench set if sensor replacement is required.

Replacing the oxygen sensor typically costs between $150 and $300, including parts and labor. Additional costs may apply if wiring or exhaust repairs are needed.

A dirty air filter is unlikely to directly cause P0137, but it may contribute to poor air-fuel mixture, which can affect sensor readings indirectly.

Resetting the code may temporarily clear the check engine light, but it won’t fix the underlying issue. Proper diagnosis and repair are necessary to resolve the problem.