Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA2011CR-V EX, 2.4 RE4, BZHAREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMADVANCED DIAGNOSTICSDTC P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLDDRIVING PATTERN
2011 Honda CR-V EX, 2.4 RE4, BZHA
Driving Pattern
2011 Honda CR-V EX, 2.4 RE4, BZHASECTION Driving Pattern
- Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on.
- Drive the vehicle at a speed between 45 - 75 mph (73 - 120 km/h) for at least 5 minutes, to warm up the TWC.
- Drive at a steady speed between 55 - 75 mph (88 - 120 km/h) for at least 10 seconds.
- Decelerate with the throttle valve fully closed.
- Repeat step 3 through step 4, four times.
- Set a vehicle speed of 55 mph (88 km/h) on the cruise control, and drive for at least 68 seconds.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.