Walk into any parts counter and you’ll see a wall of ignition coils, each with a spec sheet that reads like a foreign language. For Peugeot owners and the shops that service them, the OS3004 from OSRAM is one of those parts that shows up in more applications than most techs realize. The OE numbers 597080 and 245095 cross to five different Citroen and Peugeot models, but the real story is in what those specs tell you before you ever install the part.
Decoding the Primary and Secondary Resistance
The first numbers to understand on any ignition coil are the resistance values. For the OS3004, the primary winding sits in the 0.3–0.5 ohm range, while the secondary winding typically reads between 6,000 and 10,000 ohms. These aren’t just numbers for a multimeter test—they dictate how fast the coil charges and discharges.
A lower primary resistance means the coil can draw more current quickly, which translates to a hotter spark at high RPM. Peugeot’s 1.6 THP engines, in particular, demand this because they run higher boost pressures and need consistent ignition under load. When you see a coil with resistance values that fall outside factory specs, you’re looking at a part that will either overheat the driver circuit or produce a weak spark that causes misfires under acceleration.
IP Rating: Why It Matters on a French Engine Bay
The OS3004 carries an IP67 rating, which is worth understanding beyond the marketing gloss. The “6” means complete dust ingress protection—no particles getting into the epoxy housing. The “7” means it can survive immersion in water up to one meter for 30 minutes.
What does that mean in practice for a Peugeot 308 or Citroen C4? Engine bays on these platforms are notorious for water pooling near the coil pack after heavy rain or a careless pressure washer session. An IP67-rated coil handles that exposure without internal arcing or corrosion. Cheaper coils with lower IP ratings might fire fine on the bench but fail six months later when moisture finds its way past a poorly sealed housing.
Connector Type and Voltage Range: The Compatibility Factor
The OS3004 uses the standard Bosch-style four-pin connector found across PSA Group vehicles from the mid-2000s through the 2010s. The pinout is straightforward: 12V power, ground, and two signal wires from the engine control unit. What’s less obvious is the operating voltage range—9 to 16 volts.
That range matters more than you’d think. A failing alternator could push system voltage to 15V or higher, and an undervoltage condition during cold cranking can drop below 10V. A coil that only handles a narrow voltage window will produce weak spark at either extreme. The OS3004’s wider tolerance means it maintains consistent output even in a Peugeot with marginal charging system health—something you’ll appreciate on a 2012 207 with 150,000 kilometers and an original alternator.
What This Means for Your Shop
When you’re diagnosing a misfire on a Peugeot with a P0301 code, the coil spec sheet is your first diagnostic tool. Check resistance cold and warm. Verify the connector pins aren’t corroded before condemning the coil. And when you do replace it, the OS3004’s IP67 rating and broad voltage tolerance give you fewer comeback calls.
Pro Tip: Always check the secondary resistance at the coil tower, not just the connector. A coil can pass a connector test but fail under load if there’s internal breakdown in the secondary winding.
The Bottom Line on Coil Selection
Specs aren’t just for engineers. For Peugeot owners, the IP67 rating means the OS3004 handles the wet reality of European winters. For shops, the voltage range and connector compatibility mean fewer fitment headaches and less warranty work. The [OS3004 | OSRAM Ignition Coil | Fits Citroen, Peugeot | OE# 597080
245095](https://longweiparts.com/product/os3004-osram-ignition-coil-fits-citroen-peugeot-oe-597080245095/) at Longwei Parts covers five PSA applications with direct OE fitment—no adapter harnesses, no trimming, no surprises. If you’re already stocking the OE number 597080, this is the aftermarket alternative that doesn’t compromise on the details that actually cause failures.
Recommended Part: OS3004 – OE-quality aftermarket part, ready to ship.
