P1166 SUZUKI – Diagnosis and Solutions 🚗
🛠 Possible Causes
- 🚨 Faulty Heated Oxygen Sensor 1 (HO2S)
- 🔌 HO2S 1 Sensor Wiring Harness Open or Short Circuit
- ⚠️ Poor Electrical Connection in HO2S 1 Sensor Circuit
🔧 How to Fix P1166 SUZUKI Code
- 🔍 Check the causes listed above.
- 📎 Visually inspect the wiring harness and connectors associated with HO2S 1 sensor.
- ⚡ Look for damage: broken, bent, corroded, or improperly secured pins.
- 🔌 Test the Heated Oxygen Sensor 1 (voltage/resistance measurement according to Suzuki specifications).
⚠️ Possible Symptoms
- 📛 Check Engine Light On (or “Service Engine Soon” message).
📖 Meaning of P1166 SUZUKI Code
The Engine Control Module (ECM) detects an abnormally low voltage in the Heated Oxygen Sensor 1 (HO2S) circuit during the air-fuel mixture enrichment phase.
- 📍 Note: This code is specific to Suzuki. The description may vary depending on the vehicle model and year.
✅ Tip:
- Consult Suzuki technical bulletins or a model-specific repair manual for accurate data.
- If the sensor and electrical circuit are functional, check for underlying issues (vacuum leaks, injection problems, etc.).
🚨 Warning: This code may require Suzuki expertise for thorough diagnosis if basic checks do not resolve the issue.