P0062
HO2S Heater Control Circuit (Bank 2 Sensor 3)P0062 is a generic OBD-II powertrain diagnostic trouble code: HO2S Heater Control Circuit (Bank 2 Sensor 3). It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P0062 means
Code P0062 indicates that the Powertrain Control Module has detected a general fault — typically an open or incomplete circuit — in the heater control circuit of the third heated oxygen sensor on Bank 2, the cylinder bank that does not contain cylinder number 1. Unlike P0061, which flags abnormal resistance within the sensor heater element itself, P0062 is triggered by an electrical fault in the broader control circuit, such as broken wiring, a corroded connector, a blown fuse, or a failed power or ground path that prevents the PCM from energising the heater. The oxygen sensor heater element must reach approximately 600 °F (315 °C) before the sensor can generate a reliable voltage signal; without heater circuit continuity, the sensor remains cold for longer after engine start, prolonging the open-loop fuel enrichment phase and increasing cold-start emissions. Because Sensor 3 is located downstream of the catalytic converter and is used primarily to monitor converter efficiency rather than directly control fuel trim, the driver may notice few or no drivability symptoms. However, an accompanying catalyst monitor failure code may eventually set, and the vehicle will fail readiness-based emissions testing. Water intrusion into the sensor connector is a particularly common trigger for this code, as it can blow the heater fuse silently.
Common causes
Most-frequently reported root causes when P0062 is logged.
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1
Open or broken wiring in the heater power or ground circuit between the PCM and Bank 2 Sensor 3
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2
Corroded or damaged connector at the oxygen sensor plug interrupting circuit continuity
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3
Blown heater-circuit fuse caused by water ingress into the sensor connector
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4
Corroded or broken exhaust system ground strap causing a floating ground reference
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5
Open circuit inside the oxygen sensor heater element (also flagged as P0061)
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6
Exhaust system leak allowing unmetered air near the sensor, masking symptoms while the circuit fault persists
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7
PCM/ECM internal heater driver fault (rare)
Symptoms drivers notice
How to diagnose P0062
A typical diagnostic flow when this code is present.
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1
Retrieve all stored DTCs and freeze frame data; address any higher-priority codes (misfires, fuel trim faults) before diagnosing P0062 in isolation
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2
Visually inspect the Bank 2 Sensor 3 wiring harness and connector for obvious damage, corrosion, water intrusion marks, or chafing against exhaust pipes or chassis edges
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3
Check the heater-circuit fuse (consult the vehicle fuse box diagram) and replace if blown; also inspect the exhaust system ground strap for corrosion or breakage
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4
Unplug the sensor connector and use a digital multimeter on the ohms scale to test continuity through the two heater wires back to the PCM; infinite resistance confirms an open in the harness
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5
With the key on and engine off, backprobe the heater power supply wire at the sensor connector and verify battery voltage; absence of voltage points to a fuse, relay, or wiring fault upstream of the sensor
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6
If harness and power supply test normal, test heater element resistance directly across the sensor terminals; out-of-spec resistance indicates the sensor itself is faulty and requires replacement
Related powertrain codes
Frequently asked questions
What is the difference between P0062 and P0061?
P0061 specifically flags out-of-range resistance in the heater element inside the sensor, while P0062 indicates an open or interrupted heater control circuit anywhere between the PCM and the sensor — including wiring, fuses, connectors, or ground paths. P0062 is a broader circuit fault; P0061 is more targeted to the sensor component.
Why does water ingress cause P0062?
When water enters the oxygen sensor connector, it creates a conductive path that can momentarily short the heater circuit, blowing the heater fuse. The fuse opens the circuit, the PCM detects no current flow, and P0062 is set. Replacing only the fuse without sealing the connector will result in the fuse blowing again.
Can P0062 cause a catalyst failure code?
Yes, over time. If Sensor 3 cannot reach operating temperature promptly, it will not accurately monitor downstream oxygen levels, and the PCM may eventually set a catalyst efficiency monitor failure (P0420 or P0430). Repairing P0062 first may resolve companion catalyst codes if the sensors were otherwise functioning normally.
Is sensor replacement always required to fix P0062?
Not always. If the fault is traced to a blown fuse, corroded connector, or broken ground strap, those components can be repaired or replaced without touching the sensor. Always perform a thorough circuit inspection before purchasing an oxygen sensor to avoid unnecessary expense.
Disabling P0062 in software
RaceTune can permanently disable P0062 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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