Fuel Injectors for 2005–2019 Chrysler 300

How long do Chrysler 300 injectors typically last?

The 3.5L V6 injectors usually make it to 110,000-130,000 miles before clogging becomes an issue. The 3.6L Pentastar injectors often last longer — 120,000-150,000 miles — but carbon buildup on valves can mask injector problems earlier. The 5.7L Hemi injectors are hit-or-miss; some fail around 90,000 miles while others go 150,000-plus. Flex-fuel models tend to see failures on the earlier end of those ranges due to ethanol's cleaning effect initially, then corrosive properties long-term. If you're past 100k on any of these engines, keep an eye on fuel trims.

Can I replace Chrysler 300 injectors myself or should I take it to a shop?

The 3.5L and 3.6L V6 injectors are accessible from the top with basic hand tools — you'll pull the intake plenum and fuel rail comes off with four bolts per side. Budget three hours if you're methodical. The 5.7L Hemi is tighter but still doable in a home garage; rear cylinders require removing the intake manifold, which adds time. Biggest DIY mistake is not replacing the injector O-rings and seals even if they look okay — they harden over time and cause vacuum leaks. You'll need a fuel pressure gauge to verify flow after installation.

What are the specific symptoms of bad injectors on the 300's engines?

On the 3.5L V6, you'll get a stumble right off idle that feels like a transmission slip — it's actually cylinders four and six misfiring because those injectors clog first. The 3.6L Pentastar typically shows P0300-series codes on one bank with a cold-start shudder that disappears in thirty seconds. The 5.7L Hemi broadcasts failed injectors differently: you'll smell raw fuel strongly and might see black exhaust smoke under throttle. All three engines will eventually throw P0171/P0172 codes once fueling gets far enough off, but driveability symptoms show up first.

Do I need to replace all injectors at once on a Chrysler 300?

On the V6 engines, replacing all six makes sense if you're past 110,000 miles, because if one failed the others aren't far behind. Labor is the same whether you do one or six. On the 5.7L Hemi, it's more case-by-case — if only one injector is showing flow issues and mileage is under 100k, replacing just that cylinder works. But past 120,000 miles, do all eight. The Pentastar has a quirk where cylinders two and five fail first due to heat exposure; some guys replace those two as a pair and monitor the rest.