Why do some Honda City models fail the Vehicle Emission Test in Pakistan?

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Why do some Honda City models fail the Vehicle Emission Test in Pakistan?

Some Honda City owners report failing the motor vehicle emission test MVE due to high carbon monoxide CO and nitrogen oxides NOx emissions. What maintenance steps can help pass the test?

Sirat Ul Jinan asked on 24 Feb 2025 17:11:51 pm

1 Answer

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Car Mechanic Expert - on 24 Feb 2025 17:15:22 pm

Failing the Vehicle Emission Test MVE can be caused by:

High carbon monoxide CO levels, often linked to improper air-fuel ratios o r fuel system problems.
High nitrogen oxides NOx emissions, often caused by a malfunctioning EGR system o r faulty oxygen sensor.

Maintenance steps:

Clean o r replace the EGR valve to ensure proper exhaust gas recirculation.
Replace the oxygen sensor if it’s faulty to ensure correct air-fuel ratio.
Check the catalytic converter for blockages o r damage.
Ensure fuel injectors are working efficiently and that the air filter is clean.