Owners filed 1,312 engine-category complaints against the 2007–2009 Toyota Camry and 2006–2008 Toyota RAV4 in our copy of the NHTSA record. That's not a range we picked because it looked bad — it's the exact set of model years Toyota named in a dealer-issued Warranty Enhancement Program after its own engineers traced a piston-ring defect in the 2.4-liter 2AZ-FE four-cylinder. When the manufacturer hands you the model-year list, the complaint data either confirms it or it doesn't. Here, it does.
The 2AZ-FE was Toyota's workhorse four-cylinder through the 2000s, sold as the base engine in the Camry, RAV4, Highlander, Scion tC, and more. Around 2011, Toyota rolled out Warranty Enhancement Program ZE7, extending coverage on the piston, piston rings, and related parts for a specific band of 2AZ-equipped vehicles — among them the 2007–2009 Camry (and Camry Hybrid) and the 2006–2008 RAV4 — after a pattern of owners burning through a quart of oil or more well before a scheduled change. The defect: piston rings that didn't seal properly against the cylinder wall, letting oil past into the combustion chamber to be burned off with the exhaust.
A defect Toyota itself documented
This isn't a forum theory or an independent shop's read on a noisy engine. Toyota's own technical service bulletins for ZE7 describe an oil-consumption test procedure — a fresh oil change, then 1,200 miles of driving, then a dipstick check — and if a car lost a quart or more, the dealer replaced the piston assembly under warranty at no charge. That's a manufacturer conceding, in writing, that a specific batch of engines had a hardware defect serious enough to warrant a parts fix beyond the standard warranty term.
The 2007 Camry alone carries 486 engine complaints in our data — the single largest cluster in this six-model-year set, backed by 329 separate mileage-tagged reports. The 2007 RAV4 adds another 204. Across all six model years, the sample sizes range from 90 to 329 mileage reports each — genuinely large, reliable samples for vehicles now well into their second or third decade on the road.
Where the failures cluster
Median failure mileage across the six model years is remarkably tight: every single one lands between 80,000 and 90,000 miles. That's a narrower band than most of the failures we've charted in this series, and it tracks with how a worn or defective piston ring actually behaves — oil consumption is gradual and mileage-driven, not a sudden component failure, so it tends to cross an owner's threshold for "this is a problem" at a fairly consistent point in an engine's life. Toyota's standard powertrain warranty on these model years ran 5 years or 60,000 miles; every one of these six model years' median failure mileage falls outside that original window, which is exactly why Toyota needed a separate enhancement program to cover it at all.
The coverage has since run out
Toyota's ZE7 program offered Secondary Coverage of 10 years or 150,000 miles from a vehicle's in-service date, after an initial Primary Coverage period that ran through October 31, 2016 regardless of mileage. Do the math on a 2009 Camry first put in service that same year: ten years from 2009 puts the outer edge of that coverage at 2019. Today, in 2026, the Secondary Coverage window has closed on every vehicle in this data set. If you're buying one of these used now, don't assume ZE7 still applies — ask for the service history and find out whether the piston-ring replacement was ever done.
We are not making a recall claim in this piece, in either direction. ZE7 was a warranty enhancement program, not a safety recall, and our own recall table shows no engine-category campaign against these six model years for oil consumption specifically — but confirming a "no recall" claim requires checking NHTSA's live recall API, and we didn't run that check this cycle. We'd rather leave the recall question open than risk publishing it wrong.
What to do if you own one, or are about to
Check your oil level between changes, not just at the change. A dipstick check every couple thousand miles is the cheapest early-warning system for this failure. If the level drops noticeably and there's no leak underneath the car, that oil went out the tailpipe.
Ask about ZE7 history before you buy. A used Camry or RAV4 from these model years that already had the piston assembly replaced under the enhancement program is a materially safer purchase than one that never got the work and is now outside any Toyota coverage.
Don't ignore blue-tinged exhaust smoke or a burning-oil smell. Those are the two most common owner-reported symptoms in this failure. Left alone, chronic oil starvation from a low sump can accelerate wear on rod bearings and other components well beyond the piston rings themselves.
How we did it
Source. NHTSA engine-category owner-complaint counts and median failure mileage for the 2007–2009 Toyota Camry and 2006–2008 Toyota RAV4, from our copy of the public NHTSA complaint database, re-validated against the current snapshot on September 3, 2026. The model-year range is not our own selection — it matches the vehicles Toyota named in its publicly filed 2AZ-FE piston-ring Warranty Enhancement Program (ZE7) technical service bulletins. All six model years are charted; none were excluded for a thin sample, and every row clears a mileage sample size of 90 or more.
Caveat. NHTSA files complaints by model, not by engine, and both the Camry and RAV4 offered a 3.5L V6 alongside the 2.4L 2AZ-FE in these model years — so the model-level engine-category counts are not an engine-isolated tally; they include any engine-category complaint filed against these vehicles, not only ones that specifically describe oil consumption. Complaint counts reflect how often owners file a report, not a measured failure rate, and NHTSA complaints are unverified consumer accounts rather than confirmed defects. We are not making a recall claim in this piece, in either direction — that requires confirming against NHTSA's live recall API, which we did not run for this cycle, and we'd rather publish no recall claim than risk publishing a wrong one. The Warranty Enhancement Program details come from Toyota's own dealer technical service bulletins, publicly archived by NHTSA, not from our complaint database.