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o2 heater testing
what is best method to test o2 heater ckts on post catalyst o2 sensors? if i hook up a 12v test light to the heater terminals of the vehicle harness, KOEO i get the light to come on for split second and then it goes out. if i start the engine it does not light... Login to read more. 
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| Engine | 5.4 L |
| Trans | 4-speed Automatic (Electronic) |
| Symptoms | Mil Lamp On |
Vehicle Data
1998 Ford F-150 Lariat 5.4L Mil Lamp On
| Engine | 5.4 L |
| Trans | 4-speed Automatic (Electronic) |
| Symptoms | Mil Lamp On |
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