P0135 on the 2022 Honda CR-V
The 2022 Honda CR-V (5th generation) uses a 1.5L turbocharged four-cylinder engine (L15BE, 190 hp) across all trims, paired with a CVT transmission. The P0135 code indicates the upstream O2 sensor heater circuit has malfunctioned. The heater element inside the sensor brings it to operating temperature rapidly after engine start for emissions compliance.
How the CR-V's O2 Heater Works
The CR-V's ECM activates the O2 sensor heater immediately on startup. The heater draws current through an internal resistance wire, generating heat that brings the zirconia sensor element to its operating temperature of about 600°F in 20-30 seconds. Without the heater, the sensor takes 2-5 minutes to warm from exhaust heat alone, during which time the engine runs in open-loop mode with higher emissions.
Common Causes
- Heater element failure: The 1.5T CR-V's exhaust runs hotter than a naturally aspirated engine, which puts more thermal stress on the heater element. With 2-4 years of service, premature heater failure can occur, especially on vehicles with high cycle counts from frequent short trips.
- Blown heater fuse: The underhood fuse box contains the O2 heater fuse. A simple check that takes seconds and costs under $10 to fix if blown.
- Connector corrosion: The CR-V is popular in northern climates where road salt corrodes electrical connections. The O2 sensor connector is exposed to road spray and salt on the underside of the engine.
- Wiring short near turbo: The 1.5T routes the heater circuit wiring near the turbocharger, where heat can damage insulation over time. A short circuit will blow the fuse and potentially damage the heater element.
Symptoms
The check engine light is the primary indicator. CR-V owners may notice slightly rough cold starts and marginal fuel economy decrease on short commutes. The CVT behavior should remain normal. Once the engine reaches operating temperature, all symptoms resolve as the sensor warms from exhaust heat.
Diagnosis Steps
- Check the O2 heater fuse in the underhood fuse box.
- Disconnect the sensor and measure heater resistance: 2-15 ohms normal, open circuit = burned out heater.
- Verify 12V power supply at the heater connector with key on.
- Inspect the connector for corrosion, especially if the CR-V is used in salt-belt states.
- Check wiring near the turbocharger for insulation damage.
Repair Costs
The 2022 CR-V should be within emissions warranty (8 years/80,000 miles). If not: OEM Denso sensor: $85-$175. Aftermarket: $40-$85. Dealer labor: $100-$180. Total: $185-$355. Independent shops: $130-$260. Fuse: under $10.
DIY
The upstream O2 sensor on the CR-V 1.5T is accessible from above the engine bay. A 22mm O2 sensor socket fits the sensor. Check the fuse first, then replace the sensor if needed. Apply penetrating oil before removal, especially if the vehicle has been in service for a couple of years. DIY time: 20-40 minutes.