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P0139 Diagnostic Trouble Code Discussion for February 2015

Heated Oxygen Sensor (Bank 1 Sensor 2) Slow Response

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Trouble Ticket Help Requests for DTC P0139
Help Request Posted
2010 Mazda 3 i 2.0L MIL Lamp on VIN: JM1BL1SGXA
P0139: b1s2 slow response. ... repeats. freeze frame shows problem occurs at 57 miles per hour on deceleration. road test on highway confirms slow response. front sensor will switch 4 seconds faster than rear. replaced purge valve aprox. 1 month ago suspecting intermittent
February 19, 2015