Checks, in order
- Fuel qualityThink back to the last fill-up. Poor or contaminated fuel can cause rough running. Use top-tier fuel and note if the problem improves over the next tank.easy $ · under about $50
- Scan for codesLook for stored misfire or fuel system codes. Note which cylinder if one is named.easy $ · under about $50
- Check the air intakeLook at the intake tube and clamps between the air box and turbo for looseness, and check the air filter for blockage.easy $ · under about $50
- Look for software updatesAsk the dealer about engine calibration updates that address idle quality or hesitation.easy $ · under about $50
- Dealer diagnosisIgnition, injectors and turbo components are covered by warranty. Do not replace parts yourself.hard $$$ · shop-level job, $500+
Applies to: 6th generation 4Runner, 2025 and newer, with the 2.4L turbocharged i-FORCE and the i-FORCE MAX hybrid, both with the 8-speed automatic. This is a new platform with little long-term history, so most entries are general symptoms; when the truck is under warranty, the dealer is the right first stop.
Tools and parts for these checks
Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.
| ITEM | USED FOR | BUY |
|---|---|---|
| Bluetooth OBD2 scanner with live data | Reading and clearing codes and watching live sensor data | Shop on Amazon |
| Ignition coil | Swapping a suspect coil after the misfire follows it | Shop on Amazon |
| Spark plugs | Replacing worn plugs at the factory interval | Shop on Amazon |
More 6th Gen 4Runner problems
- Something is wrong on a new 4Runner: warranty, recalls and where to start (Body & Electrical)
- Digital gauge cluster blank, missing speedometer, or warning lights not showing at startup (Body & Electrical)
- Clunk or abrupt shift, especially 1st to 2nd, or hesitation pulling away (Transmission)
- Front brakes squealing or chirping on a new truck (Brakes)
- Hybrid won't go to READY, or dead 12 V battery in the i-FORCE MAX (Hybrid System)
- Won't start or crank on the 2.4L turbo (non-hybrid) (Starting & Charging)
All 14 6th Gen 4Runner symptoms in the interactive troubleshooter →
General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.