P0164 medium Severity

P0164: O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)

Check engine light illumination; possible rough idle, minor power loss, reduced fuel economy

Overview

P0164 indicates a high voltage signal in the oxygen sensor circuit for Bank 2 Sensor 3, typically meaning the downstream O2 sensor is producing voltage above expected range due to sensor failure, wiring issues, or PCM faults.

Common Symptoms

  • Check engine light (CEL) illuminated
  • Rough idle or hesitation during acceleration
  • Reduced fuel efficiency
  • Increased emissions or failed emissions test

Most Common Causes

Faulty Bank 2 Sensor 3 oxygen sensor high

Sensor internally shorted or producing abnormally high voltage output

Damaged or corroded wiring/connectors in the O2 sensor circuit high

Short to power or poor ground raising circuit voltage

Exhaust leaks near Bank 2 Sensor 3 medium

Extra air entering can skew sensor readings and cause high voltage

PCM/ECM sensor driver fault low

Poor signal interpretation or controller circuit failure

Diagnostic Steps

  1. Connect a professional OBD-II scanner to confirm P0164 and check for related codes
    Expected: P0164 stored; note any other oxygen sensor related codes
    Interpretation: Confirm code validity and any supporting faults
  2. Perform a visual inspection of Bank 2 Sensor 3 wiring and connectors
    Expected: No corrosion, no broken pins, insulation intact
    Interpretation: Good wiring reduces probability of circuit faults
  3. Measure O2 sensor voltage with multimeter (signal to ground)
    Expected: Voltage should fluctuate roughly 0.1–0.9 V under normal conditions
    Interpretation: If voltage is consistently high (>0.9 V), sensor or wiring issue likely
  4. Check for exhaust system leaks near the sensor location
    Expected: No audible leaks or visible damage
    Interpretation: Absence of leaks suggests issue is electrical rather than physical air intrusion
  5. If wiring and sensor checks good, evaluate PCM O2 sensor driver with advanced diagnostic tool
    Expected: No abnormal driver flags
    Interpretation: If PCM shows faults, PCM or its calibration may be considered

Repair Solutions

Replace Bank 2 Sensor 3 oxygen sensor medium
Estimated Cost: $100 - $300

Most common repair; cost varies by vehicle and part brand

Repair or replace damaged wiring/connectors medium
Estimated Cost: $50 - $200

Cost depends on extent of wiring repair needed

Fix exhaust leaks near sensor medium
Estimated Cost: $100 - $400

Depends on leak location and labor involved

PCM/ECM reprogramming or replacement hard
Estimated Cost: $400 - $1200

Consider only after ruling out sensor and wiring issues

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Incorrectly assuming catalytic converter failure without verifying O2 sensor circuit integrity

Frequently Asked Questions

Can you explain the meaning of P0164?

The P0164 code stands for O2 Sensor Circuit High Voltage (Bank 2 Sensor 3). This generally indicates an issue with the Sensors system.

Is it safe to drive with a P0164 code?

You should treat P0164 as a medium issue. Check engine light illumination; possible rough idle, minor power loss, reduced fuel economy

Symptoms associated with DTC P0164

You may experience the following: Check engine light (CEL) illuminated, Rough idle or hesitation during acceleration, Reduced fuel efficiency.

What parts fail when P0164 is set?

It can be caused by several factors, most notably: Faulty Bank 2 Sensor 3 oxygen sensor, Damaged or corroded wiring/connectors in the O2 sensor circuit, Exhaust leaks near Bank 2 Sensor 3.

What is the price difference for fixing P0164?

Expect to pay around $200 if the issue is a Repair or replace damaged wiring/connectors, but up to $1200 if the PCM/ECM reprogramming or replacement needs replacement.

What cars are affected by the P0164 code?

Yes, P0164 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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