DTC P0062 – HO2S Heater Control Circuit (Bank 2 Sensor 2).

🚨 DTC P0062 – HO2S Heater Control Circuit (Bank 2 Sensor 2)

Meaning:
The PCM detects an electrical fault (open, short, or high resistance) in the oxygen sensor heater circuit for Bank 2 Sensor 2 (downstream O2 sensor).

The heater inside the O2 sensor helps it reach operating temperature quickly. If the heater circuit isn’t working correctly, this code sets.

✅ Common Causes

Electrical:

🔌 Blown O2 heater fuse

🪫 Open heater circuit wiring

⚡ Short to power or ground

🧩 Corroded or loose connector pins

🔥 Melted wiring near exhaust

Component:

🥵 Failed O2 sensor heater element

📟 PCM driver failure (rare)

🔧 Step-by-Step Diagnosis Guide

1️⃣ Identify the Sensor

Bank 2 = the side without cylinder 1

Sensor 2 = post-catalytic converter (downstream)

2️⃣ Check Power Supply

Most HO2S heaters have:

Battery voltage on one wire (from fuse/relay)

Ground control from PCM on the other wire
🌟 Steps:

1. Turn ignition ON (engine off)
2. Back-probe the heater power wire
3. You should see 12V battery power
If no power →
➡ Check O2 heater fuse
➡ Check relay
➡ Check open in power wire

3️⃣ Check Ground Control (PCM side)

With ignition ON, check continuity from sensor heater ground wire to PCM.

Use a test lamp between power and PCM control wire:

Lamp should flash or stay ON during cold start.

If no ground switching → Suspect PCM driver (after confirming wiring).

4️⃣ Measure Heater Resistance

Disconnect the sensor and measure heater element resistance:

Sensor Condition Typical Resistance

Good heater 3–20 Ω
Open heater ∞ (OL)
Shorted heater 0–1 Ω

If resistance is outside range → Replace O2 sensor.

5️⃣ Wiring Inspection

Look for:

Melted harness near exhaust

Oil contamination

Broken wires

Terminals spread/loose

Repair as needed.

6️⃣ Clear Code & Re-check

After repairs:

Clear DTCs

Perform a cold start

Ensure P0062 does not return

🔧 Most Common Fixes in Real Workshops

🎀 Replace Bank 2 Sensor 2 O2 sensor
🎀 Repair/replace melted heater wires near catalytic converter
🎀 Replace O2 sensor heater fuse
🎀 Fix corroded connectors

Welcome to madurai car service 💐🙏.