P2C62

Code

Generic P — Powertrain

O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 3

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 43 RU: 21

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Page language: EN

Check Engine Light (MIL) illuminated
Possible poor fuel economy
Engine may run unusually rich or lean or show drivability issues under certain conditions
Failed emissions test
Possible stored related O2 sensor or fuel-trim codes

Read and record all stored and pending DTCs and freeze-frame data with a scan tool
Perform a visual inspection of the sensor, harness and connector at Bank 1 Sensor 3 for damage, corrosion, or water intrusion
Back-probe the sensor connector and observe live sensor pump-current data with a capable scan tool or scope
Check for continuity and resistance between the sensor connector and the ECM for pump, reference and ground circuits
Verify proper power/ground/reference voltages to the sensor and inspect related fuses and relays
Wiggle test harness while monitoring live data to look for intermittent faults

Pump-current signal: should be within the manufacturer-specified operating window (near expected trim/zero at stoichiometric under steady conditions); an open circuit often reports zero or out-of-range values
Reference/power: sensor reference or supply voltages present per vehicle specification at key operating conditions
Heater circuit: heater supply and resistance within specification (heater fault is a separate circuit but should be verified)
Ground: low resistance to vehicle ground at the sensor connector

Connect a scan tool, record freeze frame and live data for the pump current and lambda values. Note conditions when the code set.
Visually inspect Bank 1 Sensor 3 and wiring for damage, corrosion, heat damage, or connector contamination. Repair any obvious issues.
With ignition on (engine off), back-probe the sensor connector and confirm presence of required reference/power and ground signals. Check for correct voltages and good ground continuity to chassis and ECM.
Monitor pump-current (or lambda) live data while cranking and at idle. An open circuit typically shows a constant or default value or no response to AFR changes.
Measure continuity/resistance between the sensor pump/current pin and the ECM connector. Repair any open/high-resistance wiring or corroded terminals.
If wiring and connectors are good, verify heater circuit operation (resistance and supply) although heater faults may set separate codes.
If available, swap in a known-good/confirmed working wideband sensor or use a bench test to verify the sensor pump cell operation.
After repairs or sensor replacement clear codes and perform a drive cycle to confirm the fault does not return. If code remains and wiring is confirmed good, consider ECM diagnostics or replacement.
Document findings and any repairs performed.