Why does my Suzuki Mehran fail the emissions test every year?

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Why does my Suzuki Mehran fail the emissions test every year?

Despite regular maintenance, my Suzuki Mehran consistently fails the emissions test when I take it for inspection. What could be the underlying causes of this problem, and how can I pass the emissions test without spending too much on repairs?

Gari Specialist asked on 16 Apr 2025 17:50:30 pm

1 Answer

21 views |

Gari Master - on 16 Apr 2025 17:53:09 pm

Failing the emissions test often indicates that your vehicle is producing higher-than-acceptable levels of pollutants due to one o r more underlying issues:

Common causes:

Faulty catalytic converter: If the catalytic converter is damaged o r clogged, it can’t effectively reduce harmful emissions.

Malfunctioning oxygen sensors: If the O2 sensors are faulty, the engine may run too rich too much fuel o r too lean too little fuel, leading to excessive emissions.

Worn-out spark plugs: Old o r faulty spark plugs can cause incomplete combustion, leading to increased emissions.

Leaking exhaust system: Holes o r leaks in the exhaust system can prevent proper filtration of harmful gases.

Solutions:

Check the catalytic converter: If it’s damaged o r clogged, it will need to be replaced Rs. 10,000–15,000.

Test and replace oxygen sensors: A new O2 sensor typically costs Rs. 2,000–4,000.

Replace spark plugs: Replacing spark plugs is an affordable fix Rs. 500–1,000.

Repair exhaust leaks: A mechanic can check for leaks and weld o r replace parts as needed Rs. 1,000–3,000.

Regular tuning and engine maintenance is crucial to passing emissions tests.