P2073: MAP/MAF - Throttle Position Correlation at Idle
The P2073 code indicates that the Engine Control Module (ECM) has detected a correlation issue between the Manifold Absolute Pressure (MAP) sensor, Mass Air Flow (MAF) sensor, and Throttle Position Sensor (TPS) at idle. This typically means the calculated airflow based on throttle position does not match the actual airflow measured by the MAP or MAF sensor. Common causes include a vacuum leak, faulty sensors, or a dirty throttle body.
1. Most Common Causes
- Vacuum leak (intake manifold, hoses, gaskets)
- Faulty MAP sensor
- Faulty MAF sensor
- Faulty Throttle Position Sensor (TPS)
- Dirty or carbon-fouled throttle body
- Wiring or connector issues
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or stalling
- Poor acceleration or hesitation
- Reduced fuel economy
- Engine surging at idle
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Inspect for vacuum leaks using a smoke machine or propane enrichment.
Step 3: Check MAP, MAF, and TPS sensor readings with a scan tool at idle and compare to specifications.
Step 4: Clean the throttle body and MAF sensor if dirty.
Step 5: Test sensor wiring and connectors for damage or corrosion.
Step 6: Replace faulty sensors as needed and clear codes.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the issue can cause poor performance, stalling, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and cleaning, but sensor replacement can add $100-$300 per sensor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.