Is it safe to drive with P0135 O2 Sensor Heater Circuit Bank 1 Sensor 1?

Generally safe to drive for short distances, but the fault should be diagnosed and repaired promptly.

How much does it cost to fix P0135 O2 Sensor Heater Circuit Bank 1 Sensor 1?

Based on driver reports, repair costs typically range from $80 to $350. Costs vary by make, model and location.

🟢 P0135 O2 Sensor Heater Circuit Bank 1 Sensor 1

On This Page: 🔍 Symptoms ⚙️ Causes 🔧 All Repairs ⚠️ Avoid These 🧾 Driver Reports 📖 Repair Guides

⚡ Quick Summary

Severity Level

High

Safe to Drive?

⚠️ Drive with Caution

Safety Impact

Can become a safety issue if left unresolved

Urgency Level

🟠 Fix Soon

Check engine light. Fuel economy slightly worse. Sometimes rough idle on cold start. This fault code is stored when the engine control unit detects a specific fault condition. Common causes include sensor failures, wiring faults, and component wear. Always read additional fault codes before replacing parts — multiple codes together provide a clearer diagnosis. Clear the code after repair and test drive to confirm the fault does not return.

🔍 Symptoms

📍 Multiple ⚠️ P0135 fault code

⚙️ Possible Causes

Fault code P0135 detected Multiple Possible: P0135 = upstream O2 sensor heater not working. Cold O2 sensors take too long to reach operating temp, causing running in open loop longer. Fix: 1) Check fuse for O2 sensor heater circuit. 2) Test sensor resistance at heater terminals — should be 5-20 ohms

Repair / Solution

Based on 54 driver confirmations

0 worked · 0 did not · ⚪ Unverified

⚠️ Wrong Diagnosis?

No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.

🧾 Driver Reports

✅ Fixed P0135 = upstream O2 sensor heater not working. Cold O2 sensors take too long to reach operating temp, causing running in open loop longer. Fix: 1) Check fuse for O2 sensor heater circuit. 2) Test sensor resistance at heater terminals — should be 5-20 ohms

P0135 = upstream O2 sensor heater not working. Cold O2 sensors take too long to reach operating temp, causing running in open loop longer. Fix: 1) Check fuse for O2 sensor heater circuit. 2) Test sensor resistance at heater terminals — should be 5-20 ohms. 3) Check wiring for breaks. 4) Replace O2 sensor if heater element burned out internally. Upstream sensors (before cat) more critical than downstream. Denso and Bosch are quality choices.

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