How a Failing DV4 Injector Presents
On the small-displacement DV4 1.4, a single failing injector has a disproportionate impact on driveability because the engine has only four cylinders and only 1,398 cc of displacement to absorb the imbalance. The first symptom is almost always a noticeable shudder at idle — the engine hunts visibly between 800 and 950 rpm and the dashboard lurches with each missed firing. The second is a measurable performance drop — the small turbo cannot compensate when one cylinder is over- or under-fuelling, and the 0-60 time stretches by one to two seconds. The third is a cold-morning hard-start that resolves after eight to fifteen seconds of cranking.
On Peugeot 207 and Citroen C3 specifically, the DV4 fault often presents alongside an EGR / DPF P2002 — workshops should suspect the injector first, because an over-fuelling DV4 cylinder will load the DPF in under a thousand miles and trigger that exact code chain. Replacing the DPF without addressing the injector simply repeats the loading cycle.
