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	 2004 Toyota Sienna LE 3.3L MIL Lamp on 
		
		Toyota experts Help. This van has these 2 codes. I know that the sensor has failed. My question is, could the sensor failure cause the p0420? Thanks alot, 
                        
                            FIX posted 9/23/2009
                             
                 
                            
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           Message Closed w/FIX 
	   
	   
	   
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| VIN | 5TDBA23CO4 | 
| Engine | 3.3 L / 6 cyl / GAS | 
| Trans | 5-speed Automatic (Electronic) | 
| Delivery | FI | 
| Emissions | OBD-II Compliant | 
| Symptoms | MIL Lamp On | 
Trouble Codes
| P0136 | Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit Malfunction | 
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) | 
Message Closed w/FIX
            
            
 Vehicle Data
                2004 Toyota Sienna LE
| VIN | 5TDBA23CO4 | 
| Engine | 3.3 L / 6 cyl / GAS | 
| Trans | 5-speed Automatic (Electronic) | 
| Delivery | FI | 
| Emissions | OBD-II Compliant | 
| Symptoms | MIL Lamp On | 
Trouble Codes
| P0136 | Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit Malfunction | 
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) | 
                            
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