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Failed a PUC test recently? You're not alone. Many car owners in India encounter this issue during routine checks. Emissions test failure is usually a result of overlooked maintenance or faulty components. This guide covers what to do if your car fails emissions test, which parts could be causing the problem, and how to fix them easily, often without a visit to the mechanic.
If your car failed an emissions test, the cause is typically linked to unburnt fuel, poor combustion, or a sensor failure. Let’s look at the top culprits that trigger emissions issues and how you can address them.
A faulty oxygen sensor throws off the air-fuel ratio, which can increase tailpipe emissions and trigger the check engine light.
Oxygen sensor replacement is one of the most effective ways to fix emission test failure. Choose a high-quality OEM sensor for better accuracy and long-term reliability.
A dirty air filter limits airflow into the engine, leading to an overly rich fuel mixture. This results in incomplete combustion and high emissions.
Replace the air filter if it's clogged or overdue. This is an easy fix that helps reduce emissions and improves mileage. A clean filter is essential for keeping emissions in check and may help you pass a retest if your car failed emissions test due to airflow issues.
Faulty spark plugs can misfire, causing a spike in hydrocarbon levels during testing.
Replacing worn spark plugs can fix emissions problems quickly and improve overall engine performance. This is one of the most common repairs after a failed emissions test.
An EVAP system leak or a loose fuel cap lets fuel vapors escape, which increases emission levels.
Tighten or replace the gas cap. If the issue persists, inspect the EVAP system for small leaks or faulty valves. This step is often overlooked when trying to fix emission test failure.
Dirty oil can affect combustion and release pollutants into the exhaust system.
Get a fresh oil change and replace the oil filter. This small step can make a noticeable difference, especially if you’re retesting after your car failed emissions test recently.
Emissions test failure can be frustrating, but most issues are easy to resolve. From a simple oxygen sensor replacement to cleaning or replacing a clogged air filter, small fixes can go a long way. If you're looking for quality spare parts to pass your next test confidently, Autozilla has you covered with OEM and aftermarket options delivered to your doorstep.
Yes, a clogged air filter can lead to a rich fuel mixture, increasing hydrocarbon levels and resulting in emission test failure.
Not always, but if your check engine light is on and diagnostics point to the oxygen sensor, replacement can significantly reduce emissions.
If your car is misfiring, running rough, or shows high hydrocarbon levels on the report, faulty spark plugs may be the cause.
The EVAP system prevents fuel vapors from escaping into the air. Leaks in this system, or a loose fuel cap, can trigger emission failures.
They can. Using a quality fuel additive a few days before the test can clean fuel injectors and improve combustion, reducing emissions.
Only after fixing the root cause. Simply resetting the light without repair can lead to automatic test failure due to readiness issues.
Yes, dirty oil increases engine wear and can affect combustion quality, raising emission levels.
