What is lambda in car emissions?
Lambda represents the ratio of the amount of oxygen actually present in a combustion chamber compared to the amount that should have been present in order to obtain “perfect” combustion.
What is Lambda reading on MOT?
Lambda is a calculated rather then directly measured value. It’s used to demonstrate that the engine is running at near stoichiometric ratio, which the cat needs to operate properly. eg you could pass the other emissions if the engine was running lean, but then the cat would not be operating properly.
What causes low lambda reading?
The lambda reading on a gas tester is, to repeat, an indication of the air to fuel ratio, too high a lambda reading relates to too much oxygen. Too low a reading relates to too much fuel. If the output voltage is lower than this, i.e. 0 – 0.2 volts there will be a lean running or excess oxygen problem.
What is an exhaust lambda reading?
Lambda reading on the emission test is the oxygen content of the exhaust gas,if the other readings are ok its normally a hole in the exhaust allowing air to be drawn in (perhaps cracked manifolds/leaky joints in the system).Holding the revs up higher helps but the test should be taken between 2500 to 3000rpm.
What happens if a lambda sensor fails?
If the lambda sensor is defective, no data will be sent to the ECU, which will then use faulty information. This will most likely increase the fuel consumption, and subsequently, the polluting emissions. Eventually, this may lead to the clogging of the catalytic converter, which you will then have to replace.
What is the Hi-My emission light on a VW Golf?
Hi – My emission light issues were solved in my Golf (mk4 GTi 1.8T) with a cleaning of the MAF sensor (or replacement depending on circumstances) and also the cleaning of the throttle bodies. The efficiency of the two lead to triggering the emissions light.
What to do if you have an exhaust problem on a VW Golf?
You are going to need to find someone with a scan tool to identify the code (s) that will be logged, then carry out the neccessary tests to pinpoint the problem.
What does flashing light mean on golf MkIV?
I have also been told flashing light means an active fault when the light goes steady the fault has cleared.