P029B: The cylinder 1 mixture correction has reached its lower limit
The cylinder 1 mixture correction has reached its lower limit. Something is usually forcing it to over-correct, such as an air leak, a sensor reading wrongly or the part itself.
| Code | P029B |
|---|---|
| System | Engine and transmission |
| Group | P02xx, Fuel and injectors |
| Type | Generic: it means the same on every make |
How to read and clear P029B with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P029B with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0297 The car has gone over its programmed top speed
- P0298 The engine oil is getting too hot
- P0299 Turbocharger or supercharger underboost
- P029A The cylinder 1 mixture correction has reached its upper limit
- P029C The cylinder 1 injector is clogged
- P029D There is a leak in the cylinder 1 injector
- P029E The cylinder 2 mixture correction has reached its upper limit
- P029F The cylinder 2 mixture correction has reached its lower limit
- P0200 Injector circuit malfunction
- P0201 Injector circuit malfunction, cylinder 1
- P0202 Injector circuit malfunction, cylinder 2
- P0203 Injector circuit malfunction, cylinder 3
What does code P029B mean?
The cylinder 1 mixture correction has reached its lower limit. Something is usually forcing it to over-correct, such as an air leak, a sensor reading wrongly or the part itself.
How do you clear P029B?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P029B comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
