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 THRESHOLDENABLE CONDITIONS
2011 Honda CR-V EX, 2.4 RE4, BZHA
Enable Conditions
2011 Honda CR-V EX, 2.4 RE4, BZHASECTION Enable Conditions
ENABLE CONDITIONS
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time that secondary HO2S activity is not monitored after starting the engine | 15 seconds | - |
| Engine coolant temperature | 156 °F (69 °C) | - |
| Intake air temperature | -13 °F (-25 °C) | - |
| Estimated TWC temperature | 1,112 °F (600 °C) | - |
| Vehicle speed | 26 mph (41 km/h) | - |
| Fuel trim | 0.69 | 1.47 |
| Fuel feedback | Other than wide open throttle | |
| Closed loop at stoichiometric | ||
| No active DTCs set (prevents monitor from running) | P0010, P0011, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0133, P0134, P0135, P0137, P0138, P0139, P0141, P0171, P0172, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0335, P0339, P0340, P0341, P0344, P0351, P0352, P0353, P0354, P0443, P0496, P0497, P060A, P1009, P1109, P1128, P1129, P1157, P1172, P145C, P1659, P2101, P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176, P2195, P2227, P2228, P2229, P2238, P2252, P2279, P2646, P2647, P2648, P2649, P2A00 | |
| Other | Has record of deceleration at least once | |
| Cruise load or more | ||
RENDER: 1.0x
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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.