P0135 on the 2024 Honda CR-V
The 2024 Honda CR-V (6th generation) offers a 1.5L turbocharged four-cylinder (190 hp) and a 2.0L hybrid powertrain (204 hp combined). The P0135 code indicates a malfunction in the upstream O2 sensor heater circuit. On a 2024 model, this is a warranty-covered issue that should be repaired at no cost at your Honda dealer.
Why the Heater Matters on the CR-V
The O2 sensor heater is especially important on the CR-V Hybrid, where the engine cycles on and off during driving. Each time the engine restarts, the heater must rapidly warm the sensor to enable closed-loop fueling. A failed heater means the engine runs in less efficient open-loop mode during each restart, reducing hybrid fuel economy. On the 1.5T conventional model, the impact is primarily limited to cold starts.
Causes on a New CR-V
- Factory sensor heater defect: An individual sensor with a manufacturing flaw in the heater element. This is the most common cause on new vehicles and is a straightforward warranty replacement.
- Blown or loose heater fuse: The underhood fuse box has a dedicated O2 heater fuse. A loose fuse from production vibration or a defective fuse can trigger P0135.
- Assembly wiring issue: The heater circuit wiring may have been pinched or improperly connected during assembly.
- ECM driver issue: Rarely, the ECM's heater control circuit can have a manufacturing defect that prevents proper heater activation.
Symptoms
Check engine light is the main symptom. On the hybrid model, you may notice slightly reduced fuel economy if the engine restarts frequently during city driving. The conventional 1.5T may have a brief rough idle during cold starts. Most CR-V owners will only notice the warning light.
Warranty Coverage
Your 2024 CR-V is covered under Honda's 3-year/36,000-mile basic warranty and the federal 8-year/80,000-mile emissions warranty. Schedule a dealer appointment for free repair.
Dealer Process
- Code verification with Honda Diagnostic System (HDS).
- Heater fuse check and circuit testing.
- O2 sensor heater resistance measurement.
- TSB check for the 2024 CR-V platform.
- Sensor replacement or wiring repair as needed.
Reference Costs
Under warranty: $0. Post-warranty: OEM sensor: $90-$185. Dealer labor: $100-$180. Total: $190-$365. Honda dealer labor: $125-$175/hour.
CR-V Hybrid Specific Notes
If your CR-V is the hybrid model, emphasize to the service advisor that the heater issue affects hybrid efficiency. The sensor needs to work correctly each time the engine cycles to maintain optimal fuel economy. The hybrid's frequent engine restarts put more thermal stress on the heater element.