EXCESSIVE SULFUR/AMMONIA SMELL IN THE CABIN DURING HEAVY ACCELERATION. REPORTED ISSUE TO TOYOTA DEALER (PUENTE HILLS TOYOTA) DURING SERVICE. DEALER STATED NO TSB'S ISSUED FOR THIS PROBLEM YET, HOWEVER, STATED THAT THIS IS A KNOWN PROBLEM WITH EARLIER MODELS OF TOYOTA 4 RUNNERS. SINCE TOYOTA HAD YET TO ISSUE A TSB FOR THIS MODEL YEAR, THEY COULD NOT DO ANYTHING ABOUT IT. *TR
2007 toyota 4Runner engine problems
moderate 9 complaints filed with NHTSA · avg repair $3,100
Complaints
9
Recalls
0
Crashes
0
Avg fix
$3,100
What owners are reporting 2 most recent
VEHICLE GIVES OFF HORRIBLE SULFUR SMELL WHEN ACCELERATING QUICKLY AND SOMETIMES EVEN WHEN SLOWLY GAINING SPEED AFTER STOP AND GO TRAFFIC ON A HIGHWAY. THE DEALERSHIP WHERE I TOOK IT SAID THAT THIS IS A KNOWN PROBLEM AND THERE ISN'T ANYTHING THEY CAN DO ABOUT IT. WHY DO OTHER VEHICLE'S I OWN NOT DO THE SAME THING WITH THE SAME GAS? *TR
Common questions
How serious is the engine problem on the 2007 toyota 4Runner?
It's a documented issue but not catastrophic. 9 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Severity ratings are derived from reported crashes, fires, injuries, and fatalities.
Repair cost estimates are independent-shop national averages and may differ in your area.
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