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What is the reason for the Roewe i5 displaying an engine emission fault?

2 Answers

OLydia

07/25/25 4:35am

The reason is a decrease in the engine's power performance. Below are the relevant explanations: 1. Specific reasons: The main cause is excessive carbon deposits in the throttle or inside the engine, leading to an imbalance in the air-fuel mixture ratio. When the engine control unit detects signals that affect emission requirements, the fault light will illuminate. Another issue could be fuel quality; poor fuel quality accelerates carbon deposit formation, which might be causing the engine emission system fault. It is recommended to disassemble the intake tract to check for excessive carbon deposits. 2. Effects: Increased fuel consumption: More fuel is consumed, and over time, poor combustion leads to more carbon deposits. Reduced safety: Decreases the safety during vehicle operation and shortens the engine's service life. Poor exhaust flow: Causes sintering and peeling of the three-way catalytic converter substrate, increasing exhaust resistance. Inaccurate fuel injection: Leads to inaccurate fuel injection control by the engine control unit.

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DawsonFitz

08/10/25 5:27pm

I've been driving the Roewe i5 for several years, and when the emission fault light comes on, it's usually due to sensor issues. The oxygen sensor is the most common culprit—it monitors the oxygen levels in the exhaust, and if it gets dirty or fails, it gives inaccurate readings, triggering false emission warnings. The catalytic converter might also be clogged, leading to ineffective exhaust treatment, or the EGR system valve could be stuck, affecting exhaust gas recirculation. Sometimes, poor fuel quality, a faulty mass airflow sensor, or aging ignition coils can also trigger similar alerts. My advice is to first connect an OBD diagnostic tool to read the fault codes and pinpoint the exact cause. Don't attempt DIY repairs—take it to a professional repair shop immediately. Unresolved emission faults can lead to excessive exhaust emissions, affecting your annual inspection, increasing fuel consumption, and even causing engine misfires or major issues.

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