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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21717
Experience:  BEng hons Mech engineering, in auto industry 22 years
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hi I have a 2011 seat copa 1.6 automatic, there is a emission

Customer Question

hi I have a 2011 seat copa 1.6 automatic, there is a emission control system light my dash board and a spanner symbol keeps flashing up and I lost power
Submitted: 3 years ago.
Category: Car
Expert:  Shantal-Mod replied 3 years ago.

Hello,

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Thank you,

Shantal
Expert:  Matt replied 3 years ago.
Hello

On any car if you get a check engine light or other fault light this typically means one or more of the sensors has failed or has a faulty connection.

The ECU senses this and may put the car into 'limp home' mode which typically limits the revs and the amount of power available. Usually the car is safe to drive for a short distance as the mode is intended is intended to get you home without incurring any engine damage

The quickest route to repair is to have the car plugged into a diagnostic machine which will read off the fault code stored in the ECU (providing the light is still on at this point) and indicate which sensor has failed or whether the fault is more serious.

You can do a very rough and ready check yourself by unplugging sensors one at a time and seeing if any of them change the driving condition which would indicate the most recently unplugged sensor is the faulty one. This method is not foolproof though and reading a fault code off is the better method.

from your description this could be a faulty O2 sensor in the exhaust

1st check for exhaust leaks before the O2 sensor as if this has been experiencing an exhaust leak then it will have been running very rich as the sensor will see the extra air pulled in as fresh / lean fuelling and be adding fuel to compensate.

this can lead to catalyst failure as the extra fuel can re-light inside and melt the catalyst

The best way to find an exhaust leak is to run the engine from cold and feel around the exhaust joints with your bare hands - you'll have about 30 seconds before it all gets too hot and you should feel any escaping gas blowing over your fingers

if this is all OK then you may need a new sensor - however have the diagnostic test 1st as this will save money in the long run