PowertrainP029A
CautionSeverity: Caution - get it checked when you can
Cylinder 1 - Fuel Trim at Max Limit
Key terms: Oxygen sensor: measures oxygen in the exhaust gas · Mass air flow sensor: measures the air going into the engine · Powertrain: engine, transmission and emissions
1What it means in plain English
This code is in the powertrain range that covers fuel and air metering, over-temperature, overspeed and transmission over-temperature conditions.
2Common causes
- Dirty or faulty mass air flow sensor
- Vacuum or intake air leak
- Weak fuel pump or clogged fuel filter
- Faulty fuel injector
- Faulty oxygen sensor
- Wiring or connector fault
3Can I drive?
Do not assume this code is safe to ignore: some codes in this range affect engine safety systems. Have it diagnosed; if the engine is overheating, a red warning light is on, or the engine loses power or cuts out, stop safely and get professional help.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 22
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P029A | Pressure Relief Valve Is Open Brand | Powertrain |
| BAIC Motor | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| Mercedes-Benz | P029A | No description available | Powertrain |
| BYD | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| Chery | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| DFFS | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| DFFX | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| DFXK | P029A | Cylinder 1 fuel too rich Brand | Powertrain |
| EOBD | P029A | Cylinder 1 - fuel trim at maximum limit Brand | Powertrain |
| Geely | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| GM | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| Great Wall | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| Hafei | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| Honda | P029A | No description available | Powertrain |
| Hyundai | P029A | No description available | Powertrain |
| Isuzu | P029A | No description available | Powertrain |
| Land Rover | P029A | Cylinder 1 balance - fuel trim at maximum limit Brand | Powertrain |
| Peugeot | P029A | No description available | Powertrain |
| Saab | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| MG (SAIC) | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
| Sprinter | P029A | No description available | Powertrain |
| Toyota | P029A | Cylinder 1 - Fuel Trim at Max Limit Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 2
These 7-character codes are manufacturer-specific variants of P029A and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P029A00 | Die Mengenkorrektur für Zylinder 1 hat den oberen Grenzwert erreicht. Brand | Powertrain |
| Mercedes-Benz | P029A02 | Die Mengenkorrektur für Zylinder 1 hat den oberen Grenzwert erreicht.Es liegt ein allgemeiner Signalfehler vor. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P029xx codes.