Fuel / Air MeteringModerate ImpactPetrol

P0021 — Diagnostic Trouble Code P0021

OBD-II diagnostic code P0021 relates to the fuel / air metering system. This code is logged when the ECU detects a parameter outside its expected operating range.

4+

Affected Brands

7+

ECU Platforms

4

Related Services

2

Related DTCs

Symptoms

What the driver typically experiences when P0021 is stored

!Check Engine Light
iPossible drivability issues
iAltered fuel consumption

Why does P0021 appear after tuning?

This code may appear after ECU modifications when the affected system monitoring has not been fully recalibrated for the new operating parameters.

How proper calibration can address P0021

WEREMAP professional calibrations include comprehensive diagnostic management for all affected systems, preventing unnecessary fault codes while maintaining safe operation.

Related Tuning Services

Relevant services for the system behind P0021

Stage 1Stage 2Stage 3DTC Off

Related Diagnostic Codes

Codes from the same diagnostic system as P0021

P0018Moderate Impact

Diagnostic Trouble Code P0018

P0011Moderate Impact

Diagnostic Trouble Code P0011

Affected ECU Platforms

Bosch MED17.7.2Bosch MG1CS015Bosch MED17.7.3.1Bosch MED17.7.3Bosch ME7.3.1Bosch ME9.5Bosch ME9.7

Commonly Affected Vehicles

FordF150Bosch MG1CS015
MBGLABosch MED17.7.2
MBMLBosch MED17.7.3.1
MBGLBosch MED17.7.3
Ferrari599 GTBBosch ME7.3.1
CadillacSRXBosch ME9.5

Based on data from 4+ vehicle brands. P0021 is not limited to these models.

Frequently Asked Questions

What does P0021 mean?â–¼
OBD-II diagnostic code P0021 relates to the fuel / air metering system. This code is logged when the ECU detects a parameter outside its expected operating range.
Why does P0021 appear after ECU tuning?â–¼
This code may appear after ECU modifications when the affected system monitoring has not been fully recalibrated for the new operating parameters.
How do you prevent P0021 during remapping?â–¼
WEREMAP professional calibrations include comprehensive diagnostic management for all affected systems, preventing unnecessary fault codes while maintaining safe operation.
Which vehicles are affected by P0021?â–¼
P0021 is commonly found on Ford, MB, Ferrari, Cadillac vehicles equipped with Bosch MED17.7.2, Bosch MG1CS015, Bosch MED17.7.3.1, Bosch MED17.7.3 ECU platforms.
What other codes appear alongside P0021?â–¼
P0021 frequently appears together with P0018, P0011. These related codes typically originate from the same system modification and should be addressed together in the calibration.

Ready to Get Started?

Create your free account and access our full vehicle database and tuning services.

Create Free Account