Tata Motors — xeta gvs complaints

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Madurai, Tamil Nadu, 630551

Dear sir, i have tata indica xeta gvs petrol car. The car has different sounds and 2 pistons are not responded. I changed piston rings, head vales, clutch plates, sparkplugs also but still the problems are not solved. Please help what is the problem.in dashboard check engine light still indicates. Please help to me i checked ignition and current coil. These are worked properly. Please tell what is the problem.