The P006B: MAP – Exhaust Pressure Correlation code points to an issue where the air pressure measured by the engine’s sensors doesn’t match up with the pressure in the exhaust system. This can cause the engine to run poorly because it’s not getting the right mix of air and fuel.
P006B quick overview
| Meaning | P006B: MAP – Exhaust Pressure Correlation |
| Is it serious? | Yes, since it can affect how the engine runs and its emission levels. |
| Possible causes | – Leaks or blockages in the exhaust system – EGR valve not working right – Problems with the MAP sensor or its connections – Turbocharger system issues, if your car has one |
| How to diagnose? | Check the exhaust system for any leaks or blockages. Make sure the EGR valve is opening and closing as it should. Look over the MAP sensor and its vacuum lines for any issues. If your car has a turbocharger, check that it’s working properly. |
P006B Meaning
When a P006B code shows up, it means there’s a mismatch in air pressures that the engine control unit expects and what it’s actually getting. This can make your car feel less powerful and run unevenly. Fixing it might involve looking for leaks in the exhaust, checking if the EGR valve is clogged, or making sure the air pressure sensor is connected right.
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How to fix P006B – learn from mechanics
I looked into P006B service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Toyota P006B
Vehicle information
2014 Toyota Camry LE 2.5L
Issue + repair history
- MIL lamp on
- Rough idling reported
- Previous repairs attempted: MAP sensor replacement, Exhaust system checked for leaks
Other OBD2 Codes + Test Results
- P006B – MAP – Exhaust Pressure Correlation
Mechanic suggestions
- Thoroughly inspect exhaust system for restrictions or leaks
- Check EGR valve operation
- Verify vacuum line integrity connected to MAP sensor
Final fix
Replaced EGR valve, cleared fault code, and test drove. Issue resolved, MIL lamp remained off.
Case #2: Honda P006B
Vehicle information
2012 Honda Accord LX 2.4L
Issue + repair history
- MIL lamp on intermittently
- Complaints of reduced engine power
- Previous repairs attempted: MAP sensor replaced, Intake system inspected for leaks
Other OBD2 Codes + Test Results
- P006B – MAP – Exhaust Pressure Correlation
Mechanic suggestions
- Check exhaust system for blockages or leaks
- Inspect EGR valve for proper operation
- Test wiring and connectors related to MAP sensor for faults
Final fix
Replaced EGR valve and cleared fault code. Conducted test drive, verified issue resolved.
Case #3: Ford P006B
Vehicle information
2015 Ford Focus SE 2.0L
Issue + repair history
- MIL lamp on constantly
- Customer reported engine hesitation
- Prior repairs attempted: MAP sensor replaced, Turbocharger inspected for damage
Other OBD2 Codes + Test Results
- P006B – MAP – Exhaust Pressure Correlation
Mechanic suggestions
- Examine exhaust system for any blockages or leaks
- Test functionality of EGR valve
- Inspect turbocharger system for any issues affecting exhaust pressure readings
Final fix
Replaced EGR valve, cleared fault code, and conducted extensive road test. No further issues reported by customer.
How to diagnose P006B
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Explanation |
|---|---|
| Check the exhaust system | Look for leaks or blockages that might be messing with the exhaust pressure readings. |
| Make sure the EGR valve | Ensure it’s functioning correctly, as a faulty EGR valve can affect exhaust pressure correlation. |
| Look over the MAP sensor | Inspect for any damage or poor connections that could cause inaccurate air pressure readings. |
| If your car has a turbocharger, | Examine it for any issues that could influence the exhaust system’s pressure, affecting sensor readings. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko