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| Help ! Error Code P0420 After Scanning Sienna 2001 by yemstrad(f): 10:27pm On Jan 27, 2010 |
2001 Sienna was scanned and error code P0420 reported and the scanner says this error means Catalyst Efficiency Below Threshold, Bank 1. Please can someone tell me what i need to do to address this error code. |
| Re: Help ! Error Code P0420 After Scanning Sienna 2001 by Fhemmmy: 10:41pm On Jan 27, 2010 |
[b] The catylist moniters are often mistaken as O2 sensors By comparing the switch rates between the front (before cat) and rear (downstream of cat) the PCM knows if the cat is affecting the exaust, and how much it is affecting the exaust. If it sees little or no effect on the exaust gases that have passed through the cat, then it decides that the cat is not working anymore, ad sets a P0420, or a P0430, depending on which bank it is. To check this yourself, you will need to bring up data stream on your scanner, watch the upstream and downstream O2 parameters and see if they are following each other closely. If the cat is working right, you should see a fairly rapid switch rate, probably 5 or 6 times a minute on the front O2, but almost a flat line just above .5 volts on the rear. If the rear is switching often you proabably need a catalytic converter. You might have to replace the O2 sensor . . . .but i could be wrong, let us wait for more mechanical smart ones. Good luck[/b] |
| Re: Help ! Error Code P0420 After Scanning Sienna 2001 by arsenal4va(m): 10:48pm On Jan 27, 2010 |
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