What does the P0067 fault code mean?
P0067 is a diagnostic trouble code (DTC) applicable to all car manufacturers, meaning “Air Assisted Injector Control Circuit High.”
Background Information: Air-assisted injectors improve fuel combustion by introducing high-pressure air into the fuel injection channel, resulting in finer atomization of the gasoline. This code appears if the Electronic Control Unit (ECU) detects that the voltage in the air-assisted injector control circuit is higher than the calibrated maximum value. Possible causes include a faulty air-assisted injector solenoid or its circuit, a faulty oxygen sensor, or a faulty powertrain control module (PCM).
Symptoms of Error Code P0067:
- Increased fuel consumption
- Unstable engine starting
- Reduced engine power
- “Check Engine” light illuminated
- Increased harmful emissions
Main Causes of Error Code P0067:
- Short circuit in valve wiring
- Damaged or contaminated air supply valve
- Electronic Control Unit (ECU) malfunction
- Damaged or corroded connectors
How to Diagnose Error Code P0067?
- Read error codes using an OBD-II scanner
- Visually inspect wiring harness and connectors
- Check the resistance of the air supply valve
- Perform voltage tests on the valve terminals
- Reset the error code and restart the engine for verification
Possible Causes and Diagnostic Methods
| Possible Cause | How to Check? |
|---|---|
| Short circuit | Wiring inspection and multimeter testing |
| Valve malfunction | Resistance and voltage supply testing |
| ECU malfunction | OBD2 scanner diagnosis |
| Oxidation or damage to connectors | Visual inspection, cleaning, and replacement if necessary |
Tools Needed: OBD-II scanner, multimeter, hand tool set, contact cleaner
How to Fix Error Code P0067? (Solutions to the Problem)
Simple Fixes
- Reset error codes after initial diagnosis
- Clean connectors and contacts
- Tighten loose connections
In-depth Diagnosis and Repair Solutions
- Air supply valve replacement
- Repair or replace damaged wiring
- Check and update ECU firmware
- Replace the electronic control unit if necessary
Troubleshooting Through Symptoms
| Symptom | Possible Solution |
|---|---|
| Increased fuel consumption | Valve inspection and replacement |
| Unstable engine start | Wiring and connection diagnosis |
| “Check Engine” light on | Scan, repair, and reset |
Error Code P0067 in Different Vehicles
Ford P0067: This is common in Focus and Escape models. The error is usually related to damaged wiring or a faulty relay.
Toyota P0067: This may stem from a valve malfunction or circuit failure. It is common in Corolla and Camry models.
Honda P0067: This usually affects Civic and Accord models. It can be detected during the diagnosis of the SAI system.
BMW P0067: This is related to a damaged air supply channel. It is common in 3 Series and 5 Series models.
Volkswagen P0067: The error may occur if the secondary air supply system malfunctions. Frequently seen in Passat and Golf models.
P0067 Frequently Asked Questions
Can you drive with error code P0067?
Not recommended. While this error doesn’t directly affect safety, it can lead to decreased engine performance and increased emissions, potentially causing serious problems in the long run.
What happens if you don’t fix the P0067 error?
Ignoring the error can lead to catalytic converter damage, reduced fuel efficiency, and unstable engine operation.
Can you reset the P0067 error yourself?
Yes, using an OBD2 scanner or temporarily disconnecting the battery. However, if the problem persists, the error will reappear quickly.
Which vehicles are most commonly affected by the P0067 error?
This error is most commonly found in cars with secondary air supply systems from manufacturers such as Ford, Toyota, Honda, BMW, and Volkswagen.
Can the P0067 error be caused by a wiring problem?
Yes, damaged or shorted wiring is one of the most common causes of this error.
P0067 Related OBD2 Errors
P0410 – Secondary Air Injection System
P0411 – Secondary Air Injection System Incorrect Flow Detected
P0412 – Secondary Air Injection System Switching Valve A Circuit
Important! Ignoring this error may lead to catalytic converter failure and reduced overall engine efficiency. Do not delay diagnosis! Simply checking the condition of the connectors and wiring can save you significant costs in the future. Use high-quality diagnostic tools and follow the steps precisely to accurately locate the fault.