P0421

The P0421 code indicates that the engine control module (ECM) has detected a problem with the warm-up catalytic converter efficiency in the Ford F-150 (14th Generation, 2021-2024). This typically suggests that the catalytic converter is not performing as expected.

The P0421 code indicates "Warm Up Catalyst Efficiency Below Threshold (Bank 1)" on a 2021-2024 Ford F-150, signaling a potential issue with the catalytic converter or associated components.

The P0421 code indicates that the engine control module (ECM) has detected a problem with the catalytic converter's efficiency on a Ford F-150 (14th Generation, 2021-2024).

The P0421 code indicates that the engine control module (ECM) has detected an issue with the catalytic converter's efficiency on a Ford F-150 from the 14th generation (2021-2024).

The P0421 code indicates that the Engine Control Module (ECM) has detected an issue with the warm-up catalytic converter efficiency on a 2021-2024 Ford F-150. This code typically points to a malfunctioning catalytic converter, oxygen sensors, or exhaust leaks.

The P0421 code on a 2021 Ford F-150 indicates an issue with the warm-up catalyst efficiency, typically related to the catalytic converter or its sensors.

The P0421 code on a Ford F-150 (Fourteenth Generation, 2021-present) indicates that the engine control module (ECM) has detected an issue with the warm-up catalytic converter efficiency for bank 1.

The P0421 code indicates that the catalytic converter's warm-up efficiency is below the required threshold in a 2015-2020 Ford F-150. This typically suggests an issue with the catalytic converter or related components.

The P0421 code indicates that the engine control module (ECM) has detected a problem with the catalytic converter's efficiency, specifically that it is not functioning as intended on a Ford F-150 from the 13th generation (2015-2020).

The P0421 code indicates that the catalytic converter's efficiency is below threshold for Bank 1 in a 2015-2020 Ford F-150, potentially leading to increased emissions and reduced engine performance.

The P0421 trouble code indicates an issue with the catalytic converter’s efficiency, specifically for the catalytic converter located on Bank 1 of the Ford F-150 (12th Generation, 2009-2014).

The P0421 code indicates that the engine control module (ECM) has detected a malfunction in the warm-up catalytic converter efficiency for Bank 1 in a Ford F-150 (12th Generation, 2009-2014).