P00B8
MAP - Mass or Volume Air Flow Correlation Bank 2
Fuel & air metering
Generic OBD-II
High
What it means
P00B8 means the ECM sees a disagreement between the manifold absolute pressure (MAP) reading and the mass air flow (MAF) reading on Bank 2 — the two should track each other, and they don't. Because both feed the fuel calculation, a mismatch can cause stalling, hard starting, or limp mode until the faulty sensor or intake leak is corrected.
High
Can I keep driving? Drivable but have it checked soon — mismatched air readings can cause stalling, hard starting, or a jump into limp mode.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting or stalling
- Rough idle, hesitation, or reduced power
- Engine dropping into limp/failsafe mode
Common causes
Most likely first
- Dirty or contaminated MAF sensor giving a low readingLikely
- Faulty MAF or MAP sensorCommon
- Unmetered air/vacuum leak between the MAF and the throttleCommon
- Aftermarket or incorrectly installed air intakeLess often
- Wiring or connector fault on either sensor circuitLess often
How to diagnose & fix
Work through it in order
- Compare live MAF (grams/sec) and MAP readings against expected values at idle and under load.
- Clean the MAF sensor element with dedicated MAF cleaner and replace a clogged air filter.
- Check the intake ducting for cracks, loose clamps, or vacuum leaks that let in unmetered air.
- Inspect both sensor connectors and wiring for damage or corrosion.
- If readings still disagree, test and replace the faulty MAF or MAP sensor, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P00B8?+
For short trips, usually — but the engine may stall or drop into limp mode. Get the air-metering fault diagnosed before relying on the vehicle.
Can I just clear P00B8?+
It returns once the ECM re-compares the two air readings. Clean or repair the sensors and fix any intake leak first.
Related codes
Often seen with P00B8
Read & clear P00B8 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX