P0068

MAP/MAF - Throttle Position Correlation

Fuel & air metering Generic OBD-II High

What it means

P0068 means the air-flow readings don't agree — the manifold pressure (MAP) and/or mass air flow (MAF) sensor values don't match what the throttle position implies the engine should be drawing in. The most common trigger is a large vacuum leak, but a dirty MAF, faulty MAP, or throttle fault will do it too. Because the ECM meters fuel off these signals, drivability suffers.

High

Can I keep driving? Limited — the ECM can't trust its air-metering inputs, so expect hesitation, surging, or reduced power, and a large vacuum leak behind this code can cause rough idle or stalling.

Real-world scan data

Seen in

606

scans in the past year

Found in

0.1%

of scans

0.2%

of scans that found faults

Appears alongside · share of P0068 scans

P0171in 11.9% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Hesitation, surging, or poor acceleration
Rough idle, sometimes stalling with a large vacuum leak
Reduced power / limp mode

Common causes

Most likely first

Large vacuum or intake air leak downstream of the MAFLikely
Dirty or failing mass air flow (MAF) sensorCommon
Faulty manifold absolute pressure (MAP) sensorCommon
Throttle position sensor or throttle body faultLess often
Loose or corroded connectors on any of these sensorsLess often
Faulty engine control module (ECM), rarelyLess often

How to diagnose & fix

Work through it in order

Read live data and compare MAP, MAF, and throttle position at idle and under throttle to see which reading disagrees.
Inspect the intake for vacuum leaks — cracked hoses, loose clamps, or a torn intake boot are common triggers.
Clean or test the MAF sensor and check the MAP sensor's reading against actual manifold pressure.
Verify the throttle body and throttle position sensor track smoothly through their range.
Repair the leak or replace the faulty sensor, then clear the code and re-test.

FAQ

Quick answers

Is it safe to drive with P0068?+

Drive gently and briefly. The ECM has lost confidence in its air-metering signals, so the car may hesitate, surge, or idle poorly — and a big vacuum leak behind this code can cause stalling.

Can I just clear P0068?+

It will come back once the ECM again sees the air-metering sensors disagree. The vacuum leak or faulty sensor has to be fixed.

Read & clear P0068 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX