P2073 Code: Diagnose MAP/MAF-Throttle Correlation at Idle
P2073 Code: P2073 Means the Idle Airflow Model Does Not Agree
The PCM compares MAP, MAF and throttle position at idle. A leak, restricted or incorrect filter, biased sensor, EGR flow or calibration can break that relationship.
P2073 = Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Idle. P2073 means the controller found an implausible relationship among manifold pressure, measured airflow and throttle position at idle. Save freeze-frame data, check the correct air filter and intake path, compare MAP/MAF/TPS values, smoke-test leaks and verify EGR operation before replacing sensors.
What Does P2073 Actually Mean?
P2073 means manifold absolute pressure/mass air flow - throttle position correlation at idle. Ford OBD documentation pairs it with P2074, which performs a related correlation check at higher load. The monitor asks whether the amount of air reported by MAP or MAF is plausible for the throttle position and other operating conditions while the engine is near idle.
This is a rationality code, not a direct declaration that one sensor has failed. A split intake hose, loose clamp, wrong or distorted air filter, contaminated MAF, biased MAP, dirty throttle body, EGR flow, crankcase leak or outdated PCM calibration can make individually valid signals disagree. Diagnose the entire air path and compare live data before purchasing a MAP, MAF or throttle body.
- Ford 2011 Diesel OBD System Operation - P2073 definition
- Ford 2017 Diesel OBD System Operation - correlation monitor
- NHTSA/Chrysler bulletin - P2073 intake and calibration diagnosis
Always use the service information for the exact VIN; thresholds and test sequences differ by manufacturer.
Symptoms of P2073
P2073 may appear with P2074, P0101, P2279 or EGR codes.
Measured air and modeled airflow no longer agree.
A large leak or airflow-control error can overwhelm idle control.
Some diesel applications limit torque when air data is implausible.
Incorrect air estimation affects fueling and EGR control.
A permanent or history code may remain after the original condition is gone.
What Causes P2073? (Ranked Cheapest First)
The labels and order below are diagnostic weightings for test sequence, not published failure-rate statistics. Vehicle design, mileage and companion codes can change the ranking.
Incorrect, restricted or poorly seated air filter (20% diagnostic weighting)
Filter deformation or an unsealed airbox changes measured and modeled airflow.
How to prove it: Verify the correct OE-spec filter, airbox seal and inlet routing before sensor tests.
$15-$90Intake, charge-air or crankcase leak (20% diagnostic weighting)
Air can bypass a meter or escape between the compressor, throttle and manifold.
How to prove it: Inspect clamps and boots, then smoke- or pressure-test at the approved pressure.
$10-$1,200Contaminated or biased MAF sensor (15% diagnostic weighting)
Oil, dust or sensor drift reports airflow that does not match throttle position.
How to prove it: Compare grams/second with calculated load and known-good values; inspect the sensing element safely.
$0-$450Biased MAP sensor or restricted pressure port (15% diagnostic weighting)
A plausible-looking but incorrect pressure value breaks the correlation at idle.
How to prove it: Compare MAP with barometric pressure key-on/engine-off and inspect the pressure port.
$0-$350Throttle body deposit, adaptation or TPS issue (15% diagnostic weighting)
Actual airflow may not match commanded angle or the learned closed position.
How to prove it: Compare commanded and actual angle, inspect deposits and perform only the specified relearn.
$20-$900EGR valve or control fault (10% diagnostic weighting)
Unexpected EGR flow changes manifold pressure and fresh-air mass, especially on diesels.
How to prove it: Command EGR where supported and compare MAP/MAF response with factory limits.
$100-$1,500PCM calibration or input fault (5% diagnostic weighting)
Some applications have service updates for P2073 after hardware checks pass.
How to prove it: Check VIN-specific bulletins and calibration level before module replacement.
$0-$2,500What You'll Need
Diagnostic tools
- iCarzone UR1000 with graphable MAP, MAF, TPS and EGR data
- Smoke machine or regulated intake pressure tester
- Digital multimeter with back-probes
- Air-filter and intake inspection tools
- VIN-specific service data and calibration information
Possible parts and supplies
- Correct OE-spec air filter if inspection fails
- Intake clamps, seals, boots or charge-air hoses
- Sensor-safe MAF cleaner when approved
- MAP, MAF, throttle or EGR parts only after testing
iCarzone UR1000 Bidirectional Scan Tool with ECU Coding
Use the UR1000 to save P2073 freeze frame and graph MAP, MAF, throttle angle, EGR command, calculated load and fuel-trim data together. Supported active tests help prove whether an air leak, EGR flow or biased input breaks the idle correlation.
How to Diagnose P2073 at Home
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1
Save freeze frame and every companion code
The code-setting load and related faults tell you which part of the air model failed.
- Record P2073 status, RPM, throttle angle, MAP, MAF, EGR command, coolant temperature and battery voltage.
- Save P2074, P0101, P0106, P0068, P2279, EGR, boost and fuel-trim codes.
- Note recent air-filter, turbo, throttle, EGR or intake work.
- Do not clear a permanent code expecting it to disappear immediately.
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2
Inspect the filter, airbox and complete air path
Begin with the cheapest faults that can change or bypass measured airflow.
- Confirm the filter is the correct shape and specification and is not collapsed, wet or over-oiled.
- Latch the airbox and verify every seal, resonator, clamp and inlet tube.
- Inspect turbo and charge-air hoses on boosted engines, including their undersides.
- Check crankcase ventilation hoses and oil-cap sealing where they affect metered air.
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3
Compare MAP, MAF and throttle data
Correlation diagnosis works best when the signals are graphed together.
- Key on, engine off, compare MAP with barometric pressure where both PIDs are available.
- At warm idle, graph MAF, MAP, commanded and actual throttle angle and calculated load.
- Raise RPM smoothly and confirm each value changes without flat spots or jumps.
- Use manufacturer specifications; engine size, altitude and EGR operation change normal values.
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4
Smoke-test leaks and inspect sensor ports
A small leak has its greatest percentage effect near idle.
- Smoke-test naturally aspirated intake sections at approved low pressure.
- Use regulated pressure and the manufacturer procedure for charge-air systems.
- Inspect the MAP port for soot or oil restriction without pushing debris into the manifold.
- Inspect the MAF element visually; clean only with an approved product and procedure.
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5
Test throttle and EGR response
Unexpected throttle restriction or EGR flow can make healthy sensors disagree.
- Compare commanded and actual throttle position and check for binding or heavy deposits.
- Run supported throttle and EGR active tests while graphing MAP and MAF response.
- Verify EGR position feedback follows command and returns fully when requested.
- Perform relearns only after cleaning or repair and only when service information requires them.
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6
Check calibration, repair and complete the monitor
Software comes after the physical air path and sensor evidence.
- Repair leaks, fit the correct filter or replace only a sensor that fails its test.
- Check VIN-specific TSBs and PCM calibration when all signals and hardware pass.
- Clear codes and complete the specified warm-idle and road-test conditions.
- Confirm P2073 and companion airflow/EGR codes stay cleared and readiness progresses.
Safety: Keep hands, clothing and test equipment away from the throttle plate, belts, fans and turbocharger during active tests. Never use flammable aerosol as an intake-leak test, and regulate smoke or pressure to the manufacturer limit to avoid damaging seals and sensors.
How Much Does P2073 Cost to Fix?
| Repair | DIY Cost | Shop Cost | Notes | Type |
|---|---|---|---|---|
| Air-filter and intake inspection | $0-$90 | $100-$250 | Start here | DIY/Inspect |
| Clamp, seal or intake-hose repair | $10-$300 | $180-$1,200 | Location matters | DIY/Inspect |
| MAF/MAP inspection or cleaning | $0-$25 | $100-$220 | Approved cleaner only | DIY/Inspect |
| MAP or MAF sensor replacement | $60-$450 | $250-$850 | Test first | DIY/Inspect |
| Throttle or EGR service | $20-$500 | $250-$1,500 | Active test recommended | Shop |
| PCM software or module work | N/A | $0-$2,500 | VIN-specific/last resort | Shop |
Prices are broad U.S. estimates for July 2026. Labor rate, access and parts availability can move the final bill substantially.
Which Vehicles Commonly Report P2073?
| Make / Model | Years | Powertrain | Diagnostic Notes | Focus |
|---|---|---|---|---|
| Ford Super Duty diesel | Application dependent | 6.7L diesel and related platforms | Ford uses P2073 for MAP/MAF-throttle correlation at idle; calibration programs exist for some years. | High |
| Jeep Compass/Patriot diesel | 2011-2014 bulletin applications | 2.2L diesel | A Chrysler bulletin directs inspection of the filter and PCM software for specified VIN/build conditions. | High |
| Other diesel vehicles | When supported | MAF/MAP/EGR-controlled | Soot, EGR flow and charge-air leaks strongly affect the idle air model. | Medium |
| Turbocharged gasoline vehicles | When supported | Boosted intake systems | Inspect charge pipes, bypass valves and crankcase ventilation for unmetered air. | Medium |
| Recently serviced vehicles | Any year | Air-filter or intake work | Incorrect filters, loose airboxes and disconnected hoses deserve first priority. | High |
| Vehicles with permanent P2073 | Application dependent | Inspection/maintenance relevant | A permanent DTC may require a successful monitor cycle after repair rather than manual clearing. | Medium |
P2073 versus P2074
Both compare air-model inputs, but P2073 is the correlation check at idle and P2074 applies at higher load. P2073 gives extra diagnostic weight to small intake leaks, throttle deposits, EGR flow and learned idle conditions.
Why replacing one sensor often fails
The PCM is comparing several inputs and expected airflow. A MAP, MAF and throttle signal can each remain inside its normal electrical range while a leak, restriction, EGR fault or sensor bias makes the combination implausible.
Should You DIY or Call a Mechanic?
- ✓ The engine idles safely and there is no severe smoke, stalling or runaway symptom.
- ✓ Checks are limited to the filter, accessible hoses, sensor data and low-pressure smoke testing.
- ✓ You can graph several PIDs together and compare them with service specifications.
- ✓ No turbo removal, EGR disassembly or programming is required.
- → The engine repeatedly stalls, enters severe limp mode or produces heavy smoke.
- → Charge-air pressure testing or intake access requires specialized equipment.
- → EGR, turbocharger or throttle faults require disassembly or adaptation.
- → A permanent code remains after repair and the specified monitor cannot complete.
Frequently Asked Questions
What does P2073 mean?
What is the difference between P2073 and P2074?
Can a dirty air filter cause P2073?
Can an intake leak cause P2073?
Should I replace the MAP or MAF sensor first?
How does the iCarzone UR1000 help with P2073?
Can P2073 remain as a permanent code after repair?
How do I verify the P2073 repair?
This article is for informational purposes only. Always follow the factory service manual, safety procedures and local emissions rules for the exact vehicle. iCARZONE is not responsible for damage caused by improper diagnosis or repair.