What does the P0059 fault code mean?
The P0059 fault code, applicable to all car manufacturers, means “HO2S Heater Resistance (Bank 2, Sensor 1)“.
Background Information: The function of the oxygen sensor is to measure the oxygen content in the engine exhaust to correct the fuel injection amount, thereby achieving the optimal air-fuel ratio for the engine. In OBD fault codes, you will often see references to the number of the bank and the number of the oxygen sensor. Bank 1 refers to the bank containing cylinder 1, and the other bank is Bank 2. Regardless of the bank, the first sensor always refers to the upstream oxygen sensor (before the catalytic converter), and the second sensor always refers to the downstream oxygen sensor (after the catalytic converter). This fault code will appear if the electronic control unit (ECU) detects that the current in the heated oxygen sensor heater control circuit is too low or too high.
Symptoms of the P0059 error code
The main signs of the P0059 error are:
- “Check Engine” light illuminates
- Increased fuel consumption
- Unstable engine idle
- Poor traction and acceleration dynamics
- Increased emissions
Main causes of the P0059 error code
- Faulty oxygen sensor (HO2S)
- Damaged or worn wiring
- Corroded or contaminated connector
- Short circuit in the heating circuit
- Engine control module failure (rare)
P0059 error code in different vehicles
P0059 in Chevrolet: This error usually appears in Cruze, Malibu, and Tahoe models. The problem is usually related to an open heating circuit or connector oxidation.
P0059 in Ford: Fusion and Escape models often experience this fault due to sensor overheating. It is recommended to check the condition of the exhaust system promptly.
P0059 in BMW: The P0059 error in BMWs, especially in the 3 Series and X5 Series, indicates a problem with the original HO2S, as these systems are very sensitive to fuel quality and temperature changes.
P0059 in Toyota: This error rarely occurs in Toyota Camry and RAV4 models, mainly due to vehicle aging – oxidation and wear of the wiring. Nissan P0059: This error is common in Altima and Pathfinder models when driven frequently in wet or muddy conditions – the main problem is with the wiring protection.
How to diagnose the P0059 error code?
Step 1: Connect an OBD2 scanner and read the P0059 error code.
Step 2: Check the resistance value of the HO2S heating element (usually 5-10 ohms).
Step 3: Visually inspect the wiring harness and sensor connector.
Step 4: Check the voltage at the heater terminals (voltage should be 12V with ignition on).
Step 5: Replace the oxygen sensor if necessary and reset the error code.
| Possible Causes | How to Check？ |
|---|---|
| Burnt-out HO2S heater | Measure resistance with a multimeter |
| Damaged wiring | Perform a visual inspection and check the circuit |
| Poor connector contact | Clean and treat the connector with electrical contact cleaner |
| Electronic control module (ECM) issues | Diagnose with a scanner, check for other fault codes |
Tools Needed: OBD2 scanner, multimeter, automotive tool kit, contact cleaner
How to fix the P0059 error code? (Solutions to the problem)
Simple Fixes
- Reset the error code and see if it reappears
- Check and clean the oxygen sensor connector
- Replace the blown heater fuse (if any)
In-depth Diagnosis and Repair Solutions
- Replace the oxygen sensor (Bank 2, Sensor 1)
- Repair or replace the heater circuit
- Diagnose and possibly replace the ECM unit (as a last resort)
| Symptoms | Possible Solutions |
|---|---|
| Engine check light + increased fuel consumption | Check and replace HO2S |
| Unstable idle | Check wiring and contacts |
| Increased emissions | Check the heater circuit |
P0059 Error FAQ
Can you drive with a P0059 error code?
Yes, it’s technically possible, but not recommended. A damaged oxygen sensor can lead to increased fuel consumption and catalytic converter overload.
What does “Bank 2 Sensor 1” mean in P0059?
This indicates the front oxygen sensor (before the catalytic converter) is installed on the second bank of engine cylinders.
Can you reset the P0059 error code yourself?
Yes, you can use an OBD2 scanner or temporarily disconnect the battery. However, if the cause of the malfunction is not resolved, the error will still return.
Do I need to replace the entire oxygen sensor to resolve the P0059 error?
In most cases, yes, because the heating element is built into the sensor. However, it’s crucial to rule out wiring and connector issues before replacing the sensor.
Is the P0059 error code related to other malfunctions?
Yes, it often appears together with other errors in the oxygen sensor heating circuit, such as P0036, P0056, or P0135.
Related OBD2 errors:
P0036 – HO2S Heater Control Circuit (Bank 1, Sensor 2)
P0056 – HO2S Heater Control Circuit (Bank 2, Sensor 2)
P0135 – O2 Sensor Heater Circuit (Bank 1, Sensor 1)
Important! Even without obvious signs of malfunction, the presence of this error can affect engine efficiency and the durability of the catalytic converter. When replacing the HO2S, use only high-quality replacement parts, as the correct fuel supply and the efficiency of the emission control system depend on the accuracy of the sensor.