In India, air pollution is increasing at an alarming rate. It’s worsening in most of the metro cities due to increased number of vehicles on the road. Vehicle emissions are the prime cause of air pollution. In order to keep the pollution level under the tolerable limit, the government of India has made it mandatory for every vehicle running on the road to go through Pollution Under Control (PUC) test periodically. As per Central Motor Vehicles Rules, 1989, every vehicle that is compliant under BS-III emission norms have to go through PUC test once in every three months while the vehicles complaint under latest norms needs to get the PUC test done annually. Click here to know more about Pollution Under Control or PUC.

In spite of all the measures from government, there are still lakhs of cars running on the road without of valid PUC certificate. Just like insurance and valid driving license, valid PUC certificate is also mandatory by law. One might have to bear a penalty of Rs. 1000 for not being compliant. However, there are times when your car’s engine may not pass this test due to some reasons. Here are a few common reasons for your car to fail this test:

  • Bad or defective oxygen sensor can cause high toxic release
  • In case car is not maintained properly, ignition system of the car may get deteriorate. This can cause a failure of PUC test
  • Leakage in vacuum lines due to improper working of MAP sensor may lead to failure of PUC test
  • Breakdown in air injection pump system can cause your car to fail a PUC test

If at all your car fails in PUC test, not to worry! You can work on getting your car pass the PUC test. Here are few things that you can do:

  • Get your car checked: A vehicle can fail the PUC test even if it’s running properly and not showing any signs of problems. If your car gets failed in PUC test, PUC test failure report will be issued mentioning the necessary repairs needed. All you need to do is to rush to the showroom to get the problem fixed. Seek assistance of technicians and get the car repaired if need be. Once the problems are eliminated, you can again go for PUC test.
  • Ensure Check Engine lights are off before you it for a test: These are some of the minor issues that you can fix it yourself or with the help of your service station.

Once the problems are resolved, you need to keep below things in mind to avoid such situations in future.

  • Ensure to maintain your car properly. Give it for car cash to clean out the dirt which may enter into engine and cause many problems
  • Get your car serviced on a regular basis at a service station which can give the best service.
  • Change engine oils regularly to keep your car in a good condition. Engine oil is the most vital thing based on which engine efficiency is tested. Ensure to get this checked once in 6 months and replace or change engine oils if needed.
  • Get your car’s fuel injectors cleaned. Regular clean ups can improve the performance of fuel injector which will automatically help you reduce emission.
  • Get the air filter cleaned or changed on a regular basis. Basically, air filters helps in stopping any dirt or dust entering your engine system. Hence the air filter clogs up with dust particles which may gradually reduce the airflow to engine. This will lead to high emissions. Hence, get them checked once in 4 or 6 months. In case of over usage, change them immediately.
  • Replace fuel filter time to time for better combustion process. Over time fuel filters are clogged up with dirt which can lead to more toxic emissions. Change them whenever needed to keep the free fuel flow.


To sum it up, to pass the PUC test all you need to do is take a good care of your valued possession and maintain it properly. Get your car serviced and checked on a regular basis. Regular checking and changing of filters and fuel injectors not only help you reduce the emission it also helps you save on fuel. Go ahead and get the PUC test done. Ensure to carry a valid PUC certificate along with you.

Let’s follow the rule and protect the environment!

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