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P0133 Diagnostic Trouble Code Discussion for March 2015

Heated Oxygen Sensor (Bank 1 Sensor 1) Slow Response

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Trouble Ticket Help Requests for DTC P0133
Help Request Posted
2002 Hyundai Elantra GLS 2.0L MIL Lamp on VIN: KMHDN45D72
P0133: Heated Oxygen Sensor (Bank 1 Sensor 1) Slow Response. Po133 upstream oxygen sensor switch time too slow. A scope of pattern at 2000 rpm shows a switch time peak to peak rich of 1 second, too slow. Signal stays high(rich) for 1.3-1.4 seconds, and low(lean) for only .3-.4 seconds. A rich condition is not present an...
March 24, 2015