Tomorrow's Technician

MAY 13, 2024

This standardized many of the onboard emissions protocols and codes and allowed states to perform onboard emissions testing. As time passed, even large trucks and motorcycles adopted this same method to test the emissions status of a vehicle. The freeze frame data is stored when a test fails or a DTC is set.

Check Engine Light 246

Check Engine Light Emissions Testing Engineering Banking 246

RepairSmith

JULY 17, 2024

Definition of Diagnostic Trouble Code (DTC) P0157 Diagnostic Trouble Code (DTC) P0157 stands for “Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor 2).” ” This code appears when the downstream oxygen sensor on Bank 2 shows a low voltage signal for too long.

Banking 52

Banking Check Engine Light Emissions Testing Engineering 52

RepairSmith

JULY 17, 2024

Definition of OBD-II trouble code P0158: The P0158 code stands for “O2 Sensor Circuit High Voltage (Bank 2, Sensor 2).” ” It shows that the powertrain control module (PCM) detects a high voltage signal from the oxygen sensor located in Bank 2, Sensor 2. This is often called a “rich” condition.

Banking 52

Banking Engineering Check Engine Light Emissions Testing 52

RepairSmith

JANUARY 15, 2024

Failed Emissions Test A malfunctioning fuel pump delivering too much fuel could make the vehicle’s engine run rich, leading to a failed emissions test. This drop in fuel pressure can result in an imbalanced air-fuel mixture in the combustion chamber, which leads to poor gas mileage. Let’s find out.

Check Engine Light 52

Check Engine Light Engineering Emissions Testing Mechanic 52