Do you know the exact meaning of OBDII system ? It is used to communicate with different separate modules which are linked together as a network through the OBD interface , moreover, you can have a proper analyze and diagnose by using one of the most appropriate tools OBD2 scanner , and most of them will give you the fault code with its descriptive meaning .

What is OBD2 and what does it do in a vehicle?

OBD2 is On-Board Diagnostic (revision no.2), which means that the vehicle has an on-board self-diagnostic operational system, capable of maintaining itself and pinpointing out any initial faults. This fault detection may seem a nuisance at first when the MIL (Malfunction Illumination Light) ‘Check Engine” Auto Code readers or ‘Service Engine Soon’ do come on for driver’s attention. Understanding that this indicator may save costly automotive repairs in the future, if attended to immediately, one can only come to the conclusion that this is actually a benefit.

What does a ‘MIL’, ‘Check Engine ‘ or ‘Service Engine Soon’ mean?

These are warning indicators to inform a driver that something in the vehicle’s engine or emissions system is not functioning correctly. This warning should not be taken lightly and should be investigated accordingly before being driven any further. The only exception would be if this warning is intermittent. One has to keep in mind that there is the possibility of endangering other components like the catalyst if the fault is left unattended for too long. Take the habit of reading out all the instrumentation gauges present whenever you drive as these can give out early detection, specially the coolant temperature.

‘Check Engine’ lights up every time my vehicle is started. Is this a fault symptom?

This is actually designed purposely for two reasons and is not a fault if it goes out soon after (1-3 sec max depending on vehicle). First reason is to show that the OBD software is alive and functioning (not faulty) and also serves as a filament (bulb) and ‘MIL’ circuit test. Some vehicles can actually have a blown bulb or the ‘MIL’ circuit becomes damaged, or in the worst case scenario the OBD stopped communicating (engine probably will not run, depending on the fault).

If the ‘Check Engine’ goes on while driving what are the procedures?

There are two types of fault illuminations on this warning indicator. The worst one is the continuous illumination which preventive safety measures should be implemented immediately. This means coasting as quickly as possible to the side and stop engine immediately. Before doing so it is a good measure to check if the instrumentation gauges are reading out of range, both in coolant gauge and the oil pressure if Mileage Program Tools installed together with any other warning signals. This gives a better picture of the fault for further analysis when the fault is being diagnosed later. Never attempt to drive with this type of continuous fault indicator. The second scenario is when this illumination warning is intermittent. This is less serious and can be driven for short distances until the repairs are done. However, prolonging this situation can cause more or other damage, which in return may turn into acontinuous illumination. It is a wise decision to have the vehicle checked as soon as possible. bmw gt1

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