DTC P0057: Left Rear Ho2S Heater Circuit Low: Condition

PCM monitors control signal at terminal No. 96. If PCM turns off left rear HO2S heater (does not ground circuit) and voltage remains low, DTC is set. Causes may include the following:

• Faulty left rear HO2S.
• Open in Black/White wire between left rear HO2S harness connector terminal "A" and main relay harness connector terminal "D".
• Open or short to ground in Green/Orange wire between left rear HO2S harness connector terminal "B" and PCM harness connector terminal No. 96.
• Poor connection(s) at left rear HO2S or PCM connector.
• PCM malfunction.