B0971 Engine Trouble Code
What is B0971?
B0971 code can indicate a faulty oxygen sensor, which may eventually damage the catalytic converter (repair cost: $2,000–$2,200). Professional diagnosis costs around $200–$210. Oxygen sensors are often straightforward to replace — check your owner's manual for location and instructions. This issue should be addressed promptly to prevent further damage.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Code: | B0971 |
B0971 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
B0971 Code Structure
Understanding what each digit means in the B0971 body trouble code:
| B | 0 | 9 | 7 | 1 |
|---|---|---|---|---|
| Body Code | Intake Valve Control Solenoid Circuit Low | Injector Circuit Malfunction - Cylinders | Cylinder 10 Contribution/Balance Fault | Crankshaft Position Sensor A Circuit Low Input |
How to Fix B0971
Diagnostic Steps:
Regarding B0971, carefully inspect the wire harness near the intake manifold bracket, best accessed from below near the oil filter. Look for chafing, pinching, or damaged insulation.
Repair Solution:
Power steering pressure switch monitors system operation. If pressure changes are not detected after calibrated speed transitions, this DTC sets. Verify PSP switch operation and check for circuit opens or shorts.
Technical Notes:
B0971 DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
B0971 Description
B0971 engine trouble code is related to Crankshaft Position Sensor A Circuit Low Input.
Main Cause
The primary reason for B0971 OBD-II Engine Trouble Code is: Injector Circuit Malfunction - Cylinders.