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EmissionsMinor✅ DIY Friendly

P0158

O2 Sensor Circuit High Voltage Bank 2 Sensor 2

Downstream O2 sensor bank 2 reads consistently high voltage.

SeverityMinor
CategoryEmissions
Est. Repair Cost$100–$280
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

  • ›Rich condition passing through converter
  • ›Failed sensor stuck rich
  • ›Leaking injectors on bank 2

⚠️ Symptoms

  • ›Check engine light
  • ›Failed emissions test

✅ How to Fix — Step by Step

  • Step 1:Check for rich condition on bank 2
  • Step 2:Inspect injectors
  • Step 3:Replace downstream sensor

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0158 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Fix any rich fuel condition before replacing the downstream O2 sensor — rich exhaust poisons the catalytic converter.

Repair Cost Estimate

Full Repair Estimate
$100–$280
DIY Possible?
YES
Severity
Minor

Frequently Asked Questions

What does OBD2 code P0158 mean?+
P0158 stands for O2 Sensor Circuit High Voltage Bank 2 Sensor 2. Downstream O2 sensor bank 2 reads consistently high voltage.
What causes code P0158?+
Rich condition passing through converter; Failed sensor stuck rich; Leaking injectors on bank 2
How do I fix code P0158?+
Check for rich condition on bank 2; Inspect injectors; Replace downstream sensor
How much does it cost to fix P0158?+
Estimated repair cost for P0158 is $100–$280.
Is P0158 DIY-friendly?+
Yes — P0158 is generally DIY-friendly with basic tools.

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