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P0062 Code Explained: HO2S Heater Control Circuit Bank 2 Sensor 3 Causes, Symptoms & Fixes

P0062 code shown on an OBD-II scanner with the Bank 2 Sensor 3 oxygen sensor, catalytic converter, and heater circuit wiring highlighted.

If your OBD-II scanner displays P0062, your vehicle’s Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a malfunction in the heated oxygen sensor heater control circuit for Bank 2 Sensor 3.

The generic SAE definition for P0062 is:

HO2S Heater Control Circuit Bank 2 Sensor 3

Bank 2 Sensor 3 is generally the third oxygen sensor installed on the side of the engine opposite cylinder number one. On vehicles that use this sensor arrangement, Sensor 3 is typically positioned behind an additional or secondary catalytic converter.

Not every vehicle has a Bank 2 Sensor 3. The code is most likely to appear on vehicles with:

P0062 is a general heater circuit code. It means the ECM has detected an electrical malfunction but has not necessarily determined whether the circuit voltage is specifically too high or too low.

Common causes include:

P0062 normally causes few noticeable drivability problems because Bank 2 Sensor 3 is primarily used for emissions monitoring. However, the code can prevent readiness monitors from completing and cause the vehicle to fail an emissions inspection.

For additional diagnostic information, visit:

P0062 Quick Facts

ItemInformation
OBD-II CodeP0062
DescriptionHO2S Heater Control Circuit Bank 2 Sensor 3
CategoryPowertrain
SystemEmissions
SensorBank 2 Sensor 3
Typical LocationAfter an Additional or Secondary Catalytic Converter
SeverityLow to Moderate
Safe to Drive?Usually
Typical Repair Cost$75–650

What Does P0062 Mean?

P0062 indicates that the ECM has detected an electrical problem in the heater circuit for Bank 2 Sensor 3.

Modern oxygen sensors contain internal electric heaters. These heaters bring the sensing element up to operating temperature quickly instead of relying entirely on hot exhaust gases.

The ECM may store P0062 when it detects:

Unlike P0063 or P0064, P0062 does not identify the fault specifically as a low- or high-voltage condition. It identifies a general circuit malfunction.

What Is Bank 2 Sensor 3?

Bank 2 is the side of the engine that does not contain cylinder number one.

Sensor 3 refers to the third oxygen sensor positioned along that bank’s exhaust path.

Depending on the vehicle, it may be located:

Its main functions may include:

Because oxygen sensor arrangements vary considerably, always consult the vehicle’s service information before replacing a sensor.

Does Every Vehicle Have a Bank 2 Sensor 3?

No.

Most vehicles use one or two oxygen sensors per engine bank.

Bank 2 Sensor 3 is generally found only on vehicles with more complex exhaust and catalyst layouts.

A vehicle can set P0062 only if its ECM software supports and monitors a Bank 2 Sensor 3 heater circuit.

This distinction matters because guessing the sensor location is an excellent way to replace a perfectly functional oxygen sensor and discover that the Check Engine Light remains completely unimpressed.

Why Does Sensor 3 Need a Heater?

An oxygen sensor must reach a high operating temperature before it can produce accurate readings.

The internal heater allows Sensor 3 to warm up rapidly after startup.

This helps the ECM:

Without a functioning heater, Sensor 3 may eventually warm through exhaust heat, but it will take longer and may not meet the ECM’s expected warm-up requirements.

How the Heater Circuit Works

A typical oxygen sensor heater circuit contains:

On many vehicles, one side of the heater receives battery voltage whenever the engine is running.

The ECM then controls the ground side using a transistorized driver.

The ECM may monitor:

If the electrical readings do not match the commanded heater operation, P0062 may be stored.

How the ECM Detects P0062

The ECM typically tests oxygen sensor heater circuits during a cold start because the sensors require the most assistance before the exhaust becomes hot.

The ECM compares:

P0062 may be triggered when the ECM detects:

Depending on the vehicle, the Check Engine Light may illuminate after one failed test or after the fault occurs during multiple drive cycles.

P0062 vs P0063 vs P0064

CodeDescription
P0062HO2S Heater Control Circuit Bank 2 Sensor 3
P0063HO2S Heater Control Circuit Low Bank 2 Sensor 3
P0064HO2S Heater Control Circuit High Bank 2 Sensor 3

Generally:

The exact diagnostic logic depends on the manufacturer.

Symptoms of P0062

Common symptoms include:

Most drivers will not notice:

Because Sensor 3 normally monitors catalyst performance rather than directly controlling fuel delivery, drivability symptoms are uncommon.

Common Causes of P0062

1. Failed Oxygen Sensor Heater

The heater element inside Bank 2 Sensor 3 may burn open or develop an internal electrical fault.

This is one of the most common causes.

2. Open Heater Circuit

A broken wire, disconnected connector, or open heater element can stop current flow.

Possible causes include:

3. Shorted Heater Wiring

Wiring may short to:

A short can cause abnormal current and trigger P0062.

4. Melted Wiring Near the Exhaust

Bank 2 Sensor 3 wiring is often routed close to:

If the harness comes loose, exhaust heat can quickly melt the insulation.

5. Blown Heater Fuse

A blown fuse may remove power from the oxygen sensor heater.

Some vehicles use one fuse for several sensors, so additional heater codes may also appear.

Do not simply replace the fuse and declare victory. A fuse normally fails because excessive current occurred somewhere in the circuit.

6. Failed Heater Relay

Certain vehicles supply heater power through a dedicated or shared relay.

A failed relay may affect multiple oxygen sensor heaters.

7. Corroded Connector

Inspect the Bank 2 Sensor 3 connector for:

Corrosion can create an open circuit or excessive resistance.

8. Incorrect Oxygen Sensor

Universal splice-in oxygen sensors may have:

An OEM-quality direct-fit sensor is usually the safer choice.

9. Poor Electrical Ground

Weak engine, chassis, or ECM grounds can interfere with heater operation.

Inspect:

10. ECM Driver Failure

An internal ECM heater-control driver can fail, but this is uncommon.

The ECM should only be suspected after the sensor, fuse, relay, wiring, connectors, power supply, and ground circuit have been tested.

Is P0062 Serious?

P0062 is usually considered a low- to moderate-severity code.

The vehicle will generally continue to operate normally.

However, the code should not be ignored because it can cause:

A visible wiring short near the exhaust should be repaired promptly.

Can You Drive With P0062?

Yes, in most cases.

P0062 normally does not cause an immediate breakdown or severe engine-performance problem.

However, continuing to drive with damaged wiring may allow:

Driving is generally acceptable for a short period, but the problem should still be diagnosed before an emissions inspection or long trip.

How to Diagnose P0062

Step 1: Scan for Additional Codes

Check for related codes, including:

Record freeze-frame data before clearing anything.

Multiple heater codes may indicate a shared fuse, relay, power feed, or ground problem.

Step 2: Verify the Vehicle Uses Sensor 3

Before testing or replacing anything, confirm that the vehicle actually uses:

Use manufacturer service information or an accurate exhaust-system diagram.

Step 3: Locate Bank 2 Sensor 3

Identify cylinder number one to determine Bank 1 and Bank 2.

Then trace the Bank 2 exhaust system downstream until Sensor 3 is located.

Do not assume the rearmost visible sensor is automatically Bank 2 Sensor 3.

Step 4: Inspect the Wiring Harness

Look for:

Pay close attention to areas near exhaust components.

Step 5: Inspect the Connector

Disconnect the sensor and inspect both sides of the connector.

Look for:

Repair connector damage before condemning the sensor.

Step 6: Check the Heater Fuse

Identify the correct oxygen sensor heater fuse.

Confirm:

If the fuse is blown, test for a short before installing another one.

Step 7: Verify Heater Power

With the ignition or heater circuit commanded on, check for battery voltage at the sensor connector.

If voltage is missing, inspect:

Step 8: Measure Heater Resistance

Disconnect the sensor and measure resistance across the heater terminals.

Possible results include:

Always use manufacturer specifications because heater resistance varies considerably between sensor designs.

Step 9: Check the ECM Control Circuit

Test the control wire between the oxygen sensor and ECM for:

A wire can pass a basic continuity test and still fail under load, so voltage-drop testing may be necessary.

Step 10: Command the Heater With a Scan Tool

If bidirectional controls are available, command the Bank 2 Sensor 3 heater on and off.

Monitor:

No response may indicate a failed sensor, circuit fault, or ECM driver problem.

Step 11: Replace the Sensor if Necessary

Replace Bank 2 Sensor 3 if testing confirms:

Use an OEM or high-quality direct-fit sensor.

Step 12: Verify the Repair

After completing repairs:

  1. Clear all diagnostic trouble codes.
  2. Start the engine from cold.
  3. Monitor Bank 2 Sensor 3 heater data.
  4. Confirm the sensor reaches operating temperature.
  5. Complete the required drive cycle.
  6. Verify readiness monitors complete.
  7. Confirm P0062 does not return.

Common Repairs and Costs

RepairEstimated Cost
Oxygen sensor replacement$175–600
Wiring repair$100–450
Connector replacement$75–275
Heater fuse replacement$10–50
Heater relay replacement$50–225
Exhaust-damaged harness repair$150–650
ECM diagnosis or repair$500–1,500
ECM replacement$1,000–2,500+

Repair costs vary based on sensor accessibility, vehicle design, labor rates, and whether exhaust components must be removed.

Common Diagnostic Mistakes

Avoid these common P0062 diagnostic mistakes:

The most expensive oxygen sensor is often the perfectly good one replaced because someone skipped the wiring diagram.

Vehicles Commonly Affected

P0062 is uncommon because relatively few vehicles use a Bank 2 Sensor 3 arrangement.

It may appear on certain:

Sensor layouts vary by model, engine, exhaust configuration, and production year.

Always confirm the exact application before ordering parts.

How to Prevent P0062

Reduce the likelihood of P0062 by:

Frequently Asked Questions

What does P0062 mean?

P0062 means the ECM has detected a malfunction in the heater control circuit for Bank 2 Sensor 3.

Where is Bank 2 Sensor 3 located?

It is generally located on the side of the engine opposite cylinder number one and downstream of an additional or secondary catalytic converter.

Exact locations vary by vehicle.

Does every vehicle have Bank 2 Sensor 3?

No.

Only vehicles equipped with a third oxygen sensor on Bank 2 can set P0062.

Is P0062 serious?

Usually not immediately.

However, the fault can prevent emissions monitors from completing and may indicate damaged wiring near hot exhaust components.

Can I drive with P0062?

Usually, yes.

Most vehicles remain drivable because Sensor 3 primarily monitors emissions performance.

What commonly causes P0062?

Common causes include:

Will replacing the oxygen sensor fix P0062?

It may, especially if the internal heater has failed.

However, heater power, wiring, fuse condition, connector integrity, and ECM control should be tested first.

Is P0062 the same as P0061?

No.

P0061 indicates abnormal heater resistance.

P0062 indicates a general heater control circuit malfunction.

What is the difference between P0062 and P0063?

P0062 is a general heater circuit code.

P0063 specifically indicates a low-voltage condition in the Bank 2 Sensor 3 heater circuit.

Can P0062 cause an emissions failure?

Yes.

The code may prevent catalyst and oxygen sensor readiness monitors from completing.

Final Thoughts

The P0062 code means the ECM has detected an electrical malfunction in the Bank 2 Sensor 3 heated oxygen sensor circuit. The problem may be inside the oxygen sensor, but it can also be caused by a blown fuse, failed relay, damaged connector, open circuit, or melted wiring near the exhaust.

The first step is confirming that the vehicle actually uses a Bank 2 Sensor 3. From there, inspect the harness carefully, verify heater power, measure the heater element’s resistance, and test the ECM control circuit.

Most vehicles will continue driving normally with P0062, but leaving the fault unresolved can prevent readiness monitors from completing and turn a routine emissions inspection into an expensive reminder that the Check Engine Light was not merely providing decorative illumination.

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