P0059: O2 Sensor Heater Resistance — Bank 2 Sensor 1
What to do
No urgent driveability impact, but the sensor is genuinely worn. Expect replacement rather than wiring repair.
What this code means
Heater element resistance out of specification on the bank 2 upstream sensor. Upstream sensors work hardest and age fastest, so this is a common high-mileage finding. Where both upstream sensors report resistance faults within a short period, replacing them as a pair is usually the economical choice.
Likely causes
Start here
Less common
- Corroded or loose connector · easy
- Corroded earth connection · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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