P2259 Mercury Code - Secondary Air Injection System Control 'B' Circuit Low
Quick Answer
The P2259 diagnostic trouble code (DTC) for Mercury vehicles indicates a problem with the Secondary Air Injection System Control 'B' Circuit being lower than normal. Common causes include Faulty Secondary Air Injection Pump: The air pump responsible for injecting fresh air into the exhaust system may be malfunctioning, Wiring Issues: The wiring connecting the secondary air injection system components may be damaged or disconnected, Faulty Secondary Air Injection System Control Module: The control module that regulates the secondary air injection system may be faulty. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P2259 Mercury indicates Secondary Air Injection System Control 'B' Circuit Low.
- Common causes
- Common causes include Faulty Secondary Air Injection Pump: The air pump responsible for injecting fresh air into the exhaust system may be malfunctioning, Wiring Issues: The wiring connecting the secondary air injection system components may be damaged or disconnected, Faulty Secondary Air Injection System Control Module: The control module that regulates the secondary air injection system may be faulty.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P2259 Mercury Description
The P2259 diagnostic trouble code (DTC) for Mercury vehicles indicates a problem with the Secondary Air Injection System Control 'B' Circuit being lower than normal. The secondary air injection system is an emission control system that helps reduce harmful pollutants by introducing fresh air into the exhaust system to facilitate the combustion of unburned hydrocarbons. This code specifically points to an issue with the control circuit responsible for regulating the secondary air injection system's operation.
Common Causes of P2259 Mercury
- Faulty Secondary Air Injection Pump: The air pump responsible for injecting fresh air into the exhaust system may be malfunctioning.
- Wiring Issues: The wiring connecting the secondary air injection system components may be damaged or disconnected.
- Faulty Secondary Air Injection System Control Module: The control module that regulates the secondary air injection system may be faulty.
- Vacuum Leaks: Any leaks in the vacuum lines that connect the secondary air injection system components can cause this code to appear.
Symptoms of P2259 Mercury
- Check Engine Light: The most common symptom associated with the P2259 code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Power: The vehicle may experience a loss of power or performance due to the secondary air injection system not functioning properly.
- Increased Emissions: The vehicle may produce higher emissions due to the inefficient operation of the secondary air injection system.
- Rough Idle: The engine may idle roughly or inconsistently as a result of the issues with the secondary air injection system.
How to Fix P2259 Mercury
- Diagnose the Issue: Use a scan tool to read the DTC and determine the specific cause of the P2259 code.
- Inspect Wiring and Connections: Check the wiring and connections related to the secondary air injection system for any damage or loose connections.
- Test Secondary Air Injection Pump: Test the secondary air injection pump to ensure it is functioning properly and replace if necessary.
- Check Vacuum Lines: Inspect the vacuum lines for any leaks and repair or replace them as needed.
- Replace Control Module: If the control module is found to be faulty, it may need to be replaced to resolve the issue.
Cost to Fix P2259 Mercury
The cost of repairing the P2259 code for a Mercury vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair cost for this issue can range from $200 to $600, including parts and labor. Keep in mind that the cost may be higher if additional components need to be replaced or if the diagnosis process takes longer. It's recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.
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