I have a platz 2002. Since it has the same engine as vitz i thought i should consult here for a problem.
A few days back the while driving on CNG the check engine light on my Platz 2002 came on. When I stopped the car turned the engine off and started again the light disappeared for some time (ten mins) but than came back on.
I took the car to Nazir Motors in G-8 and after inspection he told me that it is the O2 sensor that is malfunctioning. He added that if you mostly drive the car on CNG than you don't need to replace it as a faulty O2 sensor affect fuel consumption on petrol and driving on CNG affects the sensor. He said that I am resetting the ECU and the light should go off. The light went off but came back on after three four days. The mechanic said that an O2 sensor can cost upto Rs. 8000 if you want to replace it.
My question is that what should I do? Should I replace the sensor and is the price OK?
Please note that the check engine light comes on randomly but its frquency of turning on is increasing slowly and therefore I was concerned. Please help me out. Thanks in advance.