What causes my Suzuki Wagon R to fail an emissions test?

Home > Gari Forums > Suzuki Forums > Suzuki Wagon R Forums > Suzuki Wagon R Emissions Issues Forums

What causes my Suzuki Wagon R to fail an emissions test?

Failing an emissions test can result from a variety of problems such as high CO2 levels, faulty sensors, o r engine misfires. What are the common reasons why a Wagon R may not meet emission standards, especially in older o r poorly maintained models?

Gari Specialist asked on 24 May 2025 12:23:38 pm

1 Answer

20 views |

Gari Master - on 24 May 2025 12:42:09 pm

Failing an emissions test is usually caused by high emissions levels beyond legal limits. For a Wagon R, the most frequent causes are:

Faulty oxygen sensor o r catalytic converter – These lead to improper combustion o r high tailpipe emissions.

Misfiring engine o r poor spark plugs – Incomplete combustion increases HC hydrocarbon emissions.

Bad fuel injectors o r high fuel pressure – Causes a rich fuel mixture, producing excess CO carbon monoxide.

Clogged air filter o r MAF sensor issues – Affects air-fuel balance.

Old engine oil – Surprisingly, dirty oil can contribute to excess emissions, especially in high-mileage cars.