melinaeis37
iQ DPF Exhaust Smell
Summary of the thread
A 2009 Toyota iQ diesel exhibited a DPF warning light, reduced engine power, exhaust smoke, and a strong smell, suggesting a DPF regeneration issue. These symptoms, along with increased fuel consumption, pointed to a likely problem with the exhaust back pressure sensor. A diagnostic scan confirmed the sensor was defective, and after replacement, the vehicle's performance returned to normal.
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4 comment(s)
melinaeis37 (community.author)
The warning light is constantly on, and I've seen a slight increase in fuel consumption. Does this solidify a DPF-related issue, or could there be other causes?
vincentfire94
Given the constant warning light and increased fuel consumption, it's highly probable the issue is within the DPF system, specifically a defective exhaust back pressure sensor. These sensors monitor pressure and ensure proper regeneration. When they fail, they can provide incorrect readings, preventing regeneration. While a diagnostic scan is needed, the symptoms strongly point to this. Take your Toyota iQ to a qualified workshop for inspection. Driving with a faulty DPF system can cause further damage.
melinaeis37 (community.author)
Based on your recommendation, the workshop confirmed the exhaust back pressure sensor was defective. The repair cost 245€, including the replacement and labor. The issue is resolved, and my Toyota iQ is performing optimally.
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TOYOTA
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IQ
vincentfire94
The symptoms you describe suggest a potential DPF issue. The warning light, reduced power, smoke, and strong smell are common indicators. The DPF traps soot and regenerates by burning it off. A failure or faulty sensor can cause these problems. Is the warning light constantly on, or intermittent? Have you noticed any changes in fuel consumption?