P0058 Code: Complete Guide to HO2S Heater Control Circuit High (Bank 2, Sensor 2)
P0058.1: Understanding the P0058 Code
The Diagnostic Trouble Code (DTC) P0058 indicates that your vehicle’s Powertrain Control Module (PCM) has detected an abnormally high voltage signal in the heater control circuit for the Bank 2, Sensor 2 Heated Oxygen Sensor (HO2S).
This “high” voltage condition typically means the circuit has lower resistance than expected, often pointing to a short circuit in the heater element or wiring. The PCM monitors the current flow through the heater circuit, and when it detects excessive current (indicating low resistance), it triggers the P0058 code.
Note: Unlike some oxygen sensor codes that affect fuel trims and drivability, P0058 specifically relates to the heater circuit. Your vehicle may run normally, but it will fail emissions testing until repaired.
P0058.2: Technical Breakdown of Bank and Sensor Locations
P0058.2.1: Understanding Engine Banks
To properly diagnose a P0058 code, you must first understand engine bank numbering:
| Engine Configuration | Bank 1 Location | Bank 2 Location |
|---|---|---|
| V-shaped engines (V6, V8, V10) | Side containing cylinder #1 | Opposite side of Bank 1 |
| Inline engines (I4, I5, I6) | Only one bank (Bank 1) | N/A – P0058 shouldn’t appear |
| Horizontally opposed (Boxer) | One side (typically driver’s side) | Opposite side of Bank 1 |
P0058.2.2: Understanding Sensor Positions
Oxygen sensor numbering follows a specific convention relative to the catalytic converter:
| Sensor Position | Location | Primary Function |
|---|---|---|
| Sensor 1 | Upstream (before catalytic converter) | Primary fuel mixture control |
| Sensor 2 | Downstream (after catalytic converter) | Monitor catalytic converter efficiency |
Therefore, Bank 2, Sensor 2 refers to the downstream oxygen sensor located after the catalytic converter on the engine’s second bank.
P0058.3: Symptoms of P0058 Code
| Symptom | Frequency | Description |
|---|---|---|
| Check Engine Light | Always Present | MIL illumination is the primary indicator |
| Failed Emissions Test | Very Common | Vehicle will fail inspection until code is resolved |
| Reduced Fuel Economy | Occasional | PCM may use default values affecting MPG |
| Other O2 Sensor Codes | Common | Related codes like P0054 may appear |
| No Drivability Issues | Very Common | Vehicle typically runs normally despite the code |
Warning: While P0058 itself doesn’t typically cause drivability problems, ignoring it will cause your vehicle to fail emissions testing. In some states, this can prevent you from renewing your vehicle registration.
P0058.4: Common Causes of P0058 Code
P0058.4.1: Faulty Oxygen Sensor (Most Common – 70-80% of cases)
The internal heating element within the Bank 2, Sensor 2 oxygen sensor has shorted out or failed. This creates the high voltage signal that triggers the code. The heater element resistance drops below specification, causing excessive current flow.
P0058.4.2: Damaged Wiring or Connectors (15-20% of cases)
The wiring harness leading to the oxygen sensor can be damaged by:
- Heat from exhaust components
- Road debris impact
- Rubbing against engine components
- Rodent damage
- Corrosion at connectors
P0058.4.3: Blown Fuse (5% of cases)
A blown fuse in the O2 sensor heater circuit can sometimes cause irregular voltage signals that the PCM interprets as “high.” Always check fuses first as it’s the easiest component to inspect.
P0058.4.4: Faulty PCM (Rare – less than 1% of cases)
In very rare instances, the engine computer itself could be malfunctioning. This should only be considered after all other causes have been systematically eliminated.
P0058.5: Diagnostic Procedures for P0058
Pro Tip: Always begin diagnosis with a visual inspection. Many P0058 codes are resolved by finding obvious wiring damage or connector issues.
P0058.5.1: Visual Inspection Steps
1. Locate Bank 2, Sensor 2 oxygen sensor (follow exhaust from engine bank 2, after catalytic converter)
2. Carefully trace the sensor’s wiring back to its connector (approximately 12-18 inches)
3. Look for:
- Chafed, melted, or burnt wiring insulation
- Wires touching exhaust components
- Corroded or loose connector pins
- Evidence of rodent nesting or chewing
P0058.5.2: Electrical Testing Procedures
| Test | Procedure | Expected Results |
|---|---|---|
| Fuse Check | Locate O2 sensor heater fuse in power distribution center | Fuse should be intact |
| Resistance Test | Disconnect sensor, measure resistance between heater pins | 2-20 Ω (varies by vehicle) |
| Voltage Check | Back-probe heater power wire with ignition ON | Approximately 12V (battery voltage) |
| Continuity Check | Check heater ground wire to chassis ground | Continuity (very low resistance) |
| Short to Power Test | Check heater wires for voltage with circuit off | No voltage present |
P0058.6: Repair Procedures and Cost Analysis
P0058.6.1: Oxygen Sensor Replacement
| Component | DIY Cost | Professional Cost | Notes |
|---|---|---|---|
| Aftermarket O2 Sensor | $60 – $150 | $100 – $200 | Denso, NTK, Bosch recommended |
| OEM O2 Sensor | $100 – $300 | $150 – $350 | Dealer part, exact match |
| Labor (0.5-1.0 hour) | N/A | $50 – $150 | Based on $100-$150/hr shop rate |
| Total Estimate | $60 – $300 | $150 – $500 | Most common repair |
P0058.6.2: Wiring Repair
| Component | DIY Cost | Professional Cost | Notes |
|---|---|---|---|
| Wire/Connector Kit | $10 – $30 | $20 – $50 | Heat shrink, solder, connectors |
| Labor (0.3-0.7 hour) | N/A | $30 – $105 | Simple repair vs. harness replacement |
| Total Estimate | $10 – $30 | $50 – $155 | Second most common repair |
P0058.6.3: Fuse Replacement
| Component | DIY Cost | Professional Cost | Notes |
|---|---|---|---|
| Fuse | $5 – $10 | $10 – $20 | Always identify why fuse blew |
| Total Estimate | $5 – $10 | $10 – $20 | Rarely the only needed repair |
P0058.7: Frequently Asked Questions
Yes, in most cases you can safely drive with a P0058 code. The code relates to the oxygen sensor heater circuit, not the primary sensor function, so drivability is typically unaffected. However, you should address the issue promptly as it will cause your vehicle to fail emissions testing, and in some cases, may lead to reduced fuel economy.
Both codes relate to oxygen sensor heater circuits, but they point to different sensors:
- P0058: HO2S Heater Control Circuit High (Bank 2, Sensor 2) – Downstream sensor on bank 2
- P0038: HO2S Heater Control Circuit High (Bank 1, Sensor 2) – Downstream sensor on bank 1
The diagnostic process is identical, just applied to different sensor locations.
If a P0058 code returns after sensor replacement, the most likely causes are:
- Wiring issues: There may be damaged wiring between the sensor and PCM that wasn’t addressed
- Incorrect sensor: The replacement sensor may not be compatible with your vehicle
- Poor connection: The sensor connector may be corroded or not fully seated
- Fuse problem: There may be an intermittent fuse or relay issue
- PCM issue: In rare cases, the engine computer itself may be faulty
Typically, no. The P0058 code itself won’t cause damage to other components. However, the underlying issue (such as a short circuit) could potentially affect related electrical circuits if left unaddressed for an extended period. The primary concern with P0058 is failed emissions testing and potential minor fuel economy reduction.
Diagnosis time varies based on the cause:
- Visual inspection: 10-15 minutes
- Basic electrical tests: 20-30 minutes
- Sensor replacement: 30-60 minutes (longer if sensor is seized)
- Wiring repair: 30-90 minutes depending on complexity
A professional technician can typically diagnose and repair a P0058 code in 1-2 hours total.
