Mopar Vapor Canister 4891780AB – Jeep Wrangler JK 3.8 V6 2007-2011

The vapor canister is the unremarkable box of activated charcoal nobody thinks about until the check engine light comes on or the car fails an emissions test. It collects fuel vapour from the tank and feeds it back into the intake instead of venting it to the air — and once it stops holding, the ECU logs an EVAP fault that will not clear itself.

This is the genuine Mopar part, number 4891780AB, for the 3.8 V6 Jeep Wrangler JK built between 2007 and 2011. It is the same component that came out of the car, with factory ports and mounting points, so it goes back in without improvising around the lines.

Key benefits

• Genuine Mopar — factory port geometry and mounting, so it installs in place of the old unit with no changes to the fuel system.
• Clearly defined fitment — the manufacturer catalogue lists one engine and one model-year range, so there is nothing to guess between versions.
• Both body styles — 2-door JK and 4-door JK Unlimited, including 2WD, 4WD and right-hand-drive variants.
• Fixes the cause, not the symptom — replacing a worn canister clears the EVAP fault at source rather than until the next drive cycle.

Technical data

• Mopar part number: 4891780AB
• Catalogue name: Vapor Canister / CANISTER-Vapor (EVAP system component)
• Vehicle: Jeep Wrangler JK, model years 2007-2011
• Engine: 3.8 V6
• Trims per the catalogue: X, X RHD, Sport, Sahara, Rubicon, 70th Anniversary, plus Unlimited Sport, Unlimited Sahara, Unlimited X (2WD, 4WD and RHD 4WD) and Unlimited Rubicon
• Catalogue weight: approx. 2.5 kg (5.6 lb)
• The manufacturer catalogue lists no superseded number — 4891780AB is the current part number

Who it is for

For owners of the 3.8 Wrangler JK whose diagnosis points at the evaporative emissions system, and for anyone preparing the car for a test they would rather not fail. Worth adding to the list during any larger job at the rear of the vehicle, when the tank is coming out anyway — the canister sits in the same area and it is cheaper to do both at once.

Fitting notes

The canister is plumbed into the EVAP lines and bolted to the body, so this is standard workshop work with the vehicle raised — no cutting or welding, but access from underneath. Mopar catalogues parts against the VIN, so send us yours before ordering and we will confirm the fit. Our workshop works on Wranglers every week and can carry out the replacement as well.

Why buy this one

• Genuine Mopar number rather than an equivalent of uncertain sealing.
• Fitment tied to one engine and one year range, confirmed by the catalogue.
• Fit verified against your VIN before you commit to the order.

Got an EVAP code and are not sure whether the canister or the purge valve is at fault? Send the VIN and the code and we will tell you where to start.

Frequently asked questions

Does it fit the 3.6 V6 Wrangler JK?

No. The catalogue assigns this number to the 3.8 V6 only, model years 2007-2011. The 3.6 JK (2012 onwards) takes a different part number.

Does it fit the 4-door Unlimited?

Yes. The catalogue lists both the 2-door trims (X, Sport, Sahara, Rubicon, 70th Anniversary) and the 4-door Unlimited trims, in 2WD, 4WD and right-hand-drive form.

How do I know the canister is the problem?

It usually shows up as an EVAP fault code and an illuminated check engine light. The code alone does not say which component failed — canister, purge valve or lines — so have the system diagnosed rather than replacing parts on a guess.

Are lines or brackets included?

The catalogue describes this number as the canister itself. If you also need lines or mounting hardware, send the VIN and we will look up the numbers and put the order together.