car failed mot emissions, what exactly is a fast idle test, second idle test, and natural idle test,?

Question

along with the term lamda
and what are the possible causes for this failure, and costs to fix along with re test fee

Answer 1

The mot garage would be the best people to ask. The lambda sensor detects oxygen in the exhaust gases. Too much oxygen means poor combustion. An oil change, air filter change and new spark plugs may well do the trick. If the car has a turbo a fast run along a motorway will clean up the vanes which can pick up carbon. A good garage will not charge for retest if it's back within a few days. Not all garages are that decent. Mine is.

Answer 2

The test; Testest for unburn gas in the exhaust system. There are a number of things that can cause it to fail. The wrong chip in the computer if the vehicle has been hot roded. Or a computer that is not working right. This is major cost. If nothing has been done hot rod it up. The cooling sensor could be bad not letting it go into close loop. So you have high gas reading in the exhaust. The O2 sensor is the item that cause the reading to be high. The last on the list is the convert. To find out what is causing the provlem is simple. That is to have a full computer test done on the vehicle. And replace what is hard codes first. Then run the computer test over. Before retest the vehicle run the vehicle and get it hot to normal operating temper. Do not cut it off whicle waitting to have the retest done. It has to blow less than 201. 200 passes or lower. In the log run a well maintain vehicle will give you top gas milages. That will save you money and made the vehicle last longer.

Answer 3

Exhaust emissions are tested to a set sequence and procedure, involving engine revs at particular levels. Fast idle is in the range of 2500-3000rpm, normal idle is in the range of 450-1500rpm.



The lambda sensor is fitted in the exhaust and sends signals to the engine management system to adjust fuelling, amongst other things. If yours is faulty it may be causing the engine to run too rich, as indicated by the excessive emissions.



Your re-test will only be free if the vehicle is left with the original MOT testing station for repair and then a partial re-test is carried out within 10 working days of the original MOT test.



So if you take the vehicle away and either fix it yourself or get another garage to fix it you will need to bring it back for a partial re-test within 10 working days to get the partial re-test fee which is half the full test fee.



If you bring it back to the original MOT testing station outside of 10 working days then the station will have to perform a complete MOT test and will charge the full MOT fee.



If you leave your vehicle with your MOT testing station to repair and re-test within 10 working days then only a partial retest will be necessary and this will be free.



A partial retest is where only the items that you vehicle failed on during the full MOT test are examined.



If your vehicle fails on the partial re-test then the vehicle will have to have a full MOT test when you bring it back again and the full fee will be charged.

Answer 4

If a test is idle it refers to the fact that the engine is not working under load. Fast idle is around 4,000rpm, Second idle is around 2,000rpm and natural idle is what the engine rests at without the accelerator being pressed.



Possible cause for this failure is petrol rich mixture or oil burning in the cylinder (usually because it is getting past a failing gasket) If diesel then there is too much soot in the exhaust. Have your engine tuned by a krypton tuner. This kind of tuning will optimise your engine and bring down your emissions.

Answer 5

It is an emission test. The Lambda sensor measures the O2 level in the exhaust. If this is out of standard, then you have a fail. There are both idle and fast idle for this test. Change your Lambda sensor, or try and remove it and clean the tip! This sometimes works.

Answer 6

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Answer 7

it means they test the engine at different speeds to make sure the engine is running properly.