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.
2000 Honda InsightFACTORY OEM SERVICE PROCEDURE
Catalyst (Bank 1)
DTC P0420: Test ID $04: Component ID $02
| Test ID | $04 | Test Limit Type and Component ID | $02 |
| DTC | P0420 | ||
| Test Description | Catalyst capability, monitored by measuring the fluctuation of the secondary oxygen sensor output value. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: No unit The lowest limit value: Not applicable The highest limit value: No unit |
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DTC P0420: Test ID $05: Component ID $81
| Test ID | $05 | Test Limit Type and Component ID | $81 |
| DTC | P0420 | ||
| Test Description | Catalyst capability monitored by OSC index. OSC index is calculated from the secondary oxygen sensor signal during the secondary oxygen sensor feedback control. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: No unit The lowest limit value: No unit The highest limit value: Not applicable |
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DTC P0420: Test ID $06: Component ID $81
| Test ID | $06 | Test Limit Type and Component ID | $81 |
| DTC | P0420 | ||
| Test Description | Catalyst capability monitored by the secondary oxygen sensor signal during the secondary oxygen sensor feedback control. | ||
| Store Timing | Normal judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 10 (msec.) The lowest limit value: Output value x 10 (msec.) The highest limit value: Not applicable |
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DTC P0420: Test ID $06: Component ID $80
| Test ID | $06 | Test Limit Type and Component ID | $80 |
| DTC | P0420 | ||
| Test Description | Catalyst capability monitored by the secondary oxygen sensor signal during the secondary oxygen sensor feedback control. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 10 (msec.) The lowest limit value: Output value x 10 (msec.) The highest limit value: Not applicable |
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Factory Service Tools
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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.
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