AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

P0062 diagnostic trouble code refers to a fault in the heated oxygen sensor (HO2S) heater control circuit on Bank 2 Sensor 3, typically due to wiring, sensor or control circuit faults.

Common Symptoms

Check Engine Light (MIL) illuminated
Extended cold start period without accurate O2 feedback
Reduced fuel economy
Failed emissions test

Most Common Causes

Heater circuit open or short (wiring/connectors) high

Broken, corroded, or loose wiring between ECM and Bank 2 Sensor 3 oxygen sensor heater circuit

Faulty heated oxygen sensor (Bank 2, Sensor 3) medium

Internal heater element failure inside the oxygen sensor

PCM/ECM output or internal driver fault medium

Control module may not be providing proper power or ground for heater circuit

Incorrect aftermarket information describing unrelated circuits low

Some references incorrectly label P0062 as intake manifold solenoid issue; this is not supported by primary community/technical consensus

Diagnostic Steps

Connect OBD‑II scanner and record current trouble codes and freeze‑frame data

Expected: P0062 present

Interpretation: Confirms current fault status
Visually inspect oxygen sensor harness and connector for damage, corrosion, or loose connections

Expected: Intact wiring with good contact

Interpretation: Damaged wiring suggests cause of heater circuit fault
Test heater circuit resistance across the sensor heater wires with multimeter

Expected: Low resistance within expected range (typically a few ohms)

Interpretation: Infinite or high resistance indicates heater element or wiring open
Measure voltage at sensor heater supply with ignition on

Expected: Approx. battery voltage present

Interpretation: Absent voltage suggests wiring or PCM output issue
If wiring and heater tests are normal, test PCM/ECM driver output or re‑flash software

Expected: Proper PWM/heater drive signal from PCM

Interpretation: Abnormal output indicates control module problem

Repair Solutions

Repair or replace damaged wiring/connectors medium

Estimated Cost: $50 - $200

Repair harness and ensure waterproof connectors for oxygen sensor heater circuit

Replace Bank 2 Sensor 3 heated oxygen sensor medium

Estimated Cost: $100 - $300

OEM or equivalent quality sensor recommended

Re‑flash or replace PCM/ECM hard

Estimated Cost: $500 - $1200

Only if PCM output or internal driver fault confirmed

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Intake manifold solenoid circuit issues (incorrect interpretation from unreliable sources)

Frequently Asked Questions

What does the P0062 code mean?

Technically, the P0062 code represents HO2S Heater Control Circuit Bank 2 Sensor 3. It usually points to a fault within the Exhaust.

Reflecting on severity: How bad is P0062?

With a severity level of medium, check Engine Light (MIL) illuminated; vehicle is usually drivable without major drivability loss, but emissions may be affected

What happens when the P0062 code is active?

Drivers often report: Check Engine Light (MIL) illuminated, Extended cold start period without accurate O2 feedback, Reduced fuel economy when this code is present.

What causes the P0062 code?

The most common causes are: Heater circuit open or short (wiring/connectors), Faulty heated oxygen sensor (Bank 2, Sensor 3), PCM/ECM output or internal driver fault.

How much does it cost to fix P0062?

It depends on what needs to be fixed. Repair or replace damaged wiring/connectors repairs are cheaper (~$200), while Re‑flash or replace PCM/ECM repairs are on the higher end (~$1200).

Is the P0062 code specific to Mercedes?

Yes, P0062 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

P0062: HO2S Heater Control Circuit Bank 2 Sensor 3