B2943 Engine Trouble Code
What is B2943?
B2943 indicates potential catalytic converter failure. If completely failed, your vehicle may not run properly and fuel economy will suffer significantly. Average replacement cost is $2,000–$2,140. This repair requires professional service and should not be delayed.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Code: | B2943 |
B2943 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
B2943 Code Structure
Understanding what each digit means in the B2943 body trouble code:
| B | 2 | 9 | 4 | 3 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering (Injector Circuit Malfunctions Only) | Injector Circuit Malfunction - Cylinders | Injection Pump Fuel Metering Control 'B' High | Exhaust Gas Recirculation Sensor B Circuit High |
How to Fix B2943
Diagnostic Steps:
The catalytic converter has oxygen sensors before and after it. When warm and in closed-loop mode, the upstream O2 sensor reading should fluctuate, while downstream should remain steady.
Repair Solution:
Crankshaft position sensor signals the computer for precise ignition and fuel injection timing. Faulty sensors cause rough running and reduced efficiency. Modern vehicles enter limp mode and illuminate the check-engine light.
Technical Notes:
Parts or components should not be replaced based solely on B2943 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
B2943 Description
B2943 engine trouble code is related to Exhaust Gas Recirculation Sensor B Circuit High.
Main Cause
The primary reason for B2943 OBD-II Engine Trouble Code is: Injector Circuit Malfunction - Cylinders.