P0059 code meaning
HO2S Heater Resistance Bank 2 Sensor 1
Powertrain system Generic code P00xx codes Check engine light
What P0059 means
On bank 2, this monitor checks the heating element of the upstream sensor (sensor 1, before the catalytic converter) not for an open or short circuit, but for its resistance. Many systems measure it once after a genuine cold start, when coolant and intake air temperatures show that the sensor is at ambient temperature, and correct the value for temperature; some manufacturers evaluate the heater current instead. The code is set when the value lies outside the limits for this sensor type, typically because the element has aged. Since the test often runs only after a long standstill, the code may take a night to confirm or clear. Bank 2 codes occur only on engines with two exhaust banks (V or boxer engines).
P0059 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0059
- Check engine light on, sometimes only after a cold start
- Readiness for the sensor heater stays incomplete
- Usually no drivability symptoms
Common causes of P0059
- Most likelyHeating element aged or partly damaged
- PossibleContact resistance or corrosion at connector or pins
- PossibleReplacement sensor with a different heater type fitted
- Less likelyEngine control module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor upstreamOxygen sensor heaterOxygen sensor wiring
What each part of P0059 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 59 | The exact fault in that area. |
What to do next
- Note P0059 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0059
What does P0059 mean?
P0059 means "HO2S Heater Resistance Bank 2 Sensor 1". On bank 2, this monitor checks the heating element of the upstream sensor (sensor 1, before the catalytic converter) not for an open or short circuit, but for its resistance. It is a generic code, so it means the same on every make.
Is it safe to drive with P0059?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0059 fail an emissions test?
Yes, it can. P0059 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0059 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0059 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.