BMW DTC P140B – Secondary Air Injection System Insufficient Total Flow (Bank 1 and Bank 2) and Insufficient Flow (Bank 1)
DTC P140B meaning on BMW
The DTC P140B code on a BMW indicates a fault in the Secondary Air Injection System, specifically pointing to insufficient total flow in both Bank 1 and Bank 2 of the engine.
BMW DTC P140B symptoms
Symptoms of the BMW DTC P140B code may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance or power
- Increased emissions
- Engine misfires or rough idling
BMW DTC P140B causes
Common causes of the BMW DTC P140B code include:
- Faulty Secondary Air Injection Pump
- Blocked or restricted Secondary Air Injection System passages
- Malfunctioning Secondary Air Injection System valves
- Wiring or electrical issues in the system
BMW DTC P140B seriousness
The DTC P140B code should not be ignored as it can lead to increased emissions, reduced engine performance, and potential damage to other components if left unresolved. It is recommended to address this issue promptly to ensure proper engine operation and emissions compliance.
How to diagnose DTC P140B on BMW
To diagnose the DTC P140B on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes and freeze frame data
- Inspect the Secondary Air Injection System components for any visible damage or blockages
- Test the Secondary Air Injection Pump and valves for proper operation
- Check the wiring and connectors for any signs of damage or corrosion
How to fix DTC P140B on BMW
To fix the DTC P140B on a BMW, the following steps may be taken:
- Replace the faulty Secondary Air Injection Pump or valves if necessary
- Clean out any blockages or restrictions in the system passages
- Repair any damaged wiring or connectors in the Secondary Air Injection System
- Clear the fault codes and reset the Check Engine Light using a diagnostic scanner
How to erase DTC P140B on BMW
To erase the DTC P140B code on a BMW, follow these steps:
- Use a diagnostic scanner to clear the fault codes from the vehicle’s computer
- Ensure that the underlying issue causing the fault code has been addressed and resolved
- Start the engine and check for any recurrence of the DTC P140B code