What is the code for an evaporative emission system leak?
The check engine light came on and the code it was diagnosed with is P0442 and P0455. The place we took it to did not have the smoke ma… I have checked the vacuum lines running from the control unit to the tank and do not find any cracks etc. I have used a vacuum pump to check the system, small line to the control unit from a tap in the line.
How big is a leak in the EVAP system?
The vehicle’s PCM (powertrain control module) tests the evaporative emissions (EVAP) system for large and small leaks among other conditions. In the case of this DTC, it indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04″ in diameter.
How does the OBD II Enhanced EVAP system work?
The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks.
How to repair a p0442 EVAP system leak?
With a P0442, the most common DIY repair is to: 1 Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back. 2 Otherwise, replace the gas cap (we recommend an OEM original part, not aftermarket part), or 3 Visually inspect the EVAP system for cuts/holes in tubes/hoses
How to detect an evaporative emission control system leak?
P0456 Evaporative Emission Control System Leak Detected (very small leak) P0457 Evaporative Emission Control System Leak Detected (fuel cap loose/off) P1443 Evaporative Emission Control System Control Valve Malfunction P1455 Evaporative Emission Control System Leak Detected (Gross Leak/No Flow)
What does small leak code mean on OBD-II?
The small leak code tells you that the leak is probably minor. If your OBD-II diagnostic scanner registers a P0442 DTC, you must find and repair an EVAP system leak. Here are some common reasons you may see this code: Now that you understand the possible causes of this DTC, you need to know how to fix the problem.
Which is the code for an EVAP leak?
Common EVAP leak codes include: ● P0442 Evaporative Emission (EVAP) System Small Leak Detected ● P0455 Evaporative Emission (EVAP) System Leak Detected (large) ● P0440 Evaporative Emission (EVAP) System
Where is the diagnostic socket on a Mercedes SL Class 129?
The diagnostic socket is located under the hood at passenger side Go to the OBD2