Code
P1167
DAEWOO
P — Powertrain
O2S (B2)CONT. ADAPTION
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EN: 3
RU: 3
AI status
Completed
Completed
100%
Causes
- Faulty or slow responding O2 sensor (Bank 2 upstream or downstream depending on vehicle configuration)
- Open/shorted/damaged wiring or poor connector(s) to O2 sensor (heater or signal)
- Failed O2 sensor heater circuit (sensor not reaching operating temperature)
- Exhaust leak on bank 2 (upstream of sensor) or intake vacuum leak affecting that bank
- Fuel delivery problems (low/high fuel pressure, leaking/inoperative injector(s) on bank 2)
- Contaminated sensor (oil, coolant, silicone, fuel additives)
Symptoms
- Check Engine Lamp (MIL) illuminated
- Rough idle or intermittent misfire on the bank 2 side
- Reduced fuel economy
- Poor driveability during warm‑up or steady cruise
- Possible failed emissions test
- Stored freeze frame data showing abnormal fuel trim or O2 sensor response
What to check
- Read freeze frame and live data with a capable scan tool: monitor O2 voltages, short and long term fuel trims (STFT/ LTFT) for bank 2, and PID status flags
- Compare bank 1 vs bank 2 O2 voltages and fuel trims — large differences indicate bank‑specific issue
- Inspect O2 sensor wiring and connector for damage, corrosion, and secure connection
- Check for exhaust leaks on bank 2 upstream of the sensor and intake vacuum leaks
- Measure O2 sensor heater resistance and verify heater supply voltage/power/ground
- Perform a fuel pressure and fuel injector balance test if trims suggest fueling problem
Signal parameters
- Upstream (pre‑cat) oxygen sensor expected voltage: ~0.1–0.9 V alternating (switching) in closed loop; switching frequency typically ~0.5–2 Hz at idle when healthy
- Downstream (post‑cat) oxygen sensor expected voltage: more stable ~0.3–0.6 V or slow/low switching if equipped with wideband or downstream sensor
- Heater circuit: typical resistance commonly in the 3–20 Ω range (manufacturer specific) — should show continuity; heater supply should have battery voltage when key on/engine running
- Short‑term fuel trim (STFT) and long‑term fuel trim (LTFT) for Bank 2 should generally be close to Bank 1 (within ~±5–10%) — large deviation indicates fueling or sensor problem
Diagnostic algorithm
- Retrieve and record freeze frame, MIL status, and all related codes. Note engine coolant temp, load, rpm at fault.
- Clear codes, start engine and perform a live data check. Observe Bank 2 O2 sensor voltage, STFT and LTFT while engine reaches operating temperature and during a short road test.
- Visually inspect the Bank 2 O2 sensor connector and harness for damage, corrosion, melted insulation, or signs of repair. Wiggle test harness while observing live data for intermittent faults.
- Verify O2 sensor heater: with key on (engine off) check for voltage supply to heater circuit; measure heater resistance with sensor unplugged. Replace sensor if heater open or out of spec.
- Backprobe the O2 signal with scope or multimeter: confirm upstream sensor switches between ~0.1–0.9 V in closed loop. If signal is slow, stuck, or absent, suspect sensor or wiring.
- Compare Bank 1 vs Bank 2 behavior. If Bank 1 is normal and Bank 2 abnormal, focus on hardware/wiring/sensors on Bank 2 and associated injectors.
- Check for exhaust leaks upstream of the Bank 2 sensor and for intake manifold or vacuum leaks that affect that bank.
- Check fuel pressure and perform injector balance/operation checks if fuel trims indicate rich/lean condition localized to bank 2.
- Inspect catalytic converter condition on bank 2 if downstream sensor shows unexpected behavior or converter efficiency codes are present.
- If wiring, heater, and fuel/system checks pass, consider replacing the Bank 2 O2 sensor with a correct OEM/quality part. After repair clear codes and perform a full drive cycle to verify the fault is resolved.
- If problem persists after sensor replacement and wiring verified, consider PCM software update or professional diagnosis for intermittent PCM/harness faults.
Likely causes
- Bank 2 upstream O2 sensor electrically open or slow to switch
- Heater circuit open or no power to heater on bank 2 sensor
- Connector corrosion or chafed wiring at the sensor harness
- Vacuum leak or intake gasket leak on bank 2 affecting sensor feedback
- Fuel trim on bank 2 significantly different from bank 1 due to injector or fuel pressure issue
Fault status
Status
O2 Sensor Bank 2 Control Adaptation — PCM detected that oxygen sensor feedback or fuel trim adaptation for Bank 2 is outside expected limits, preventing correct closed‑loop fuel control.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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