OBD2 Car ScannerWhat does P2259 mean?
P2259 stands for Secondary Air Injection System Control B Circuit Low. The engine computer has found a problem with how fuel and air are measured or mixed. This affects fuel economy, emissions and sometimes how smoothly the engine runs.
Powertrain codes cover the engine, transmission and emissions. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Vacuum or intake air leaks
- Dirty or faulty mass airflow (MAF) sensor
- Faulty oxygen sensor or its wiring
- Fuel pressure problems (pump, filter or regulator)
- Clogged or leaking fuel injectors
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does P2259 mean?
P2259 means “Secondary Air Injection System Control B Circuit Low”. It belongs to the fuel and air metering group: The engine computer has found a problem with how fuel and air are measured or mixed. This affects fuel economy, emissions and sometimes how smoothly the engine runs.
Is it safe to drive with P2259?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear P2259?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- P2255O2 Sensor Negative Current Control Circuit Low Bank 2 Sensor 1
- P2256O2 Sensor Negative Current Control Circuit High Bank 2 Sensor 1
- P2257Secondary Air Injection System Control A Circuit Low
- P2258Secondary Air Injection System Control A Circuit High
- P2260Secondary Air Injection System Control B Circuit High
- P2263Turbocharger/Supercharger Boost System Performance
- P2264Water in Fuel Sensor Circuit
- P2265Water in Fuel Sensor Circuit Range/Performance
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.