P0032

Heated Oxygen Sensor (HO2S) Heater Control Circuit High (Bank 1 Sensor 1)

Car Fault Codes Emissions & exhaust

Can you still drive? Yes, normally

Who can fix it? DIY with some experience

Typical repair time 30 minutes – 1.5 hours

Typical cost SAR 100 to 900

What it means

An oxygen sensor has an electric heater that brings it to working temperature quickly. The engine computer has detected higher than expected voltage or current in the heater control circuit of the Bank 1 Sensor 1 oxygen sensor (upstream of the catalytic converter), most often from a shorted heater or a control wire touching a voltage source. The sensor then takes longer to give usable readings after a cold start, so the engine runs longer on an estimated mixture and uses a little more fuel.

Symptoms5

Check engine light on.
Slightly higher fuel consumption, especially on short trips.
Higher emissions after a cold start.
Repeatedly blown heater fuse in some cases.
Failed emissions inspection because of the warning light.

Possible causes5

Internal short in the sensor heater drawing more current than normal.
Control wire shorted to a power wire or another voltage source.
Wiring insulation damaged by exhaust heat or rubbing.
A replacement sensor that does not match the vehicle specification.
Fault in the control circuit inside the ECU (rare).

How to diagnose5

Unplug the sensor and measure heater resistance; a reading below specification means an internal short.
Check the control wire for a short to voltage by measuring voltage on it with the sensor unplugged and the ignition on.
Inspect the wiring along its route, especially near the exhaust and clips, for damaged insulation.
Confirm the installed sensor part number matches the one specified for the vehicle.
Check the fuse; if it has blown, do not replace it before finding the short.

How to fix5

Repair any short or damaged insulation, and route the wiring away from the exhaust.
Replace the blown fuse after removing the cause of the short.
Replace the oxygen sensor if heater resistance is below specification.
Use a sensor that matches the part number specified for the vehicle.
Clear the codes, drive until the sensor tests complete and confirm the code does not return.

Repair cost

0–500

500–2,000

2,000–5,000

5,000+

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low when a fuse or wire is to blame, and rises when the oxygen sensor must be replaced; its price depends on the sensor type and the vehicle.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

Does this code affect fuel economy?

Slightly, because the upstream sensor takes longer to work after a cold start, so the computer relies on an estimated mixture for longer. It does not harm the engine, but it is worth fixing.

Can the heater be repaired without replacing the sensor?

No. The heater is built into the sensor, so a failed heater means replacing the whole sensor. Check the fuse and wiring first, though, because they are cheaper to fix.

Why does the heater fuse blow again after replacing it?

Because the short is still there, usually in the sensor itself or in a wire rubbing on the exhaust or body. Find the short before fitting a new fuse.

This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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