1999 Toyota Sienna Engine cooling Problems
- Complaints
- 39about this part
- Share
- 18%of 215 total for the year
- Median mileage
- 79,000miles
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA recorded 39 complaints about the engine cooling of the 1999 Toyota Sienna, 18% of the 215 complaints for this model year. Where a mileage was given, the median is 79,000 miles. 1 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I have a Toyota Sienna 99 and my check light coming out and start to smoke so I find the engine do the oil be sludge, I want to know if is some way of Toyota fix this problem for me whit out charge because is a manufacture problem.”
NHTSA complaint #10361130, filed 2010-10, 118,580 miles“Oil sludge.started blowing at stop lights and all startups.calling Toyota this week. This Sienna is in mint condition.we bought it for safety and dependability for our 7 week old son.now we'll see if Toyota stands behind it.this is our 1st Toyota,but there are 7 lexus/toyotas' within our families.this engine is damaged and from what we have read,expect a complete new one.”
NHTSA complaint #10070908, filed 2004-01, 79,000 miles“I am reporting another Toyota sticky accelerator pedal. Our 1999 Sienna minivan has had 3 incidents of stuck accelerator, the most recent was jan. 21, 2010. I believe it has become stuck between 40 and 45mph. Other incidents were in summer (cannot remember date) and october 2009. The 1st incident was brief and corrected quickly by pushing down on the pedal to free it , the 2nd incident required braking and putting the car in neutral and shoving the pedal with my foot to the left and right to free it up. …”
NHTSA complaint #10302973, filed 2010-01, 122,000 miles“My van had first engine oil sludge problem at 32782 miles in march 2003. Finally Toyota paid the repair cost after many phone calls. One year later, on july 5,2004, I found that there is no engine oil left again during the middle of our family vacation trip (at 46000 miles). And blue smoke comes out from exhaust pipe again. Toyota couldn't fix the problem by clearing changing some parts. I request Toyota replace the defect engine.”
NHTSA complaint #10088276, filed 2004-08, 45,600 miles“Waiting to hear from Toyota on our oil sludge engine failure problem. We are gathering the oil change receipts and were 1st told we did not maintain the vehicle. Now seeing that we are not alone with this issue.”
NHTSA complaint #10069250, filed 2004-01, 67,000 milesRelated service bulletins
- 10015670Apr 1, 2005Diagnostic - engine repair manual correction. 00400-rm657-u.
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2013 | 1 | 1% |
| 2012 | 1 | 0% |
| 2011 | 6 | 1% |
| 2010 | 4 | 2% |
| 2009 | 4 | 2% |
| 2008 | 12 | 3% |
| 2007 | 14 | 4% |
| 2006 | 4 | 0% |
| 2005 | 17 | 2% |
| 2004 | 46 | 2% |
| 2003 | 6 | 6% |
| 2002 | 16 | 9% |
| 2001 | 24 | 13% |
| 2000 | 66 | 18% |
| 1999 | 39 | 18% |
| 1998 | 33 | 11% |
Other parts of the 1999 Toyota Sienna
36 complaintsTires
28 complaintsSteering
21 complaintsLatches, locks and linkages
19 complaintsOther or unknown
16 complaintsBrakes
15 complaintsSuspension
14 complaintsTransmission and drivetrain
11 complaintsElectrical system
10 complaintsAir bags
7 complaintsFuel system
6 complaintsSeat belts
6 complaints
← All problems reported for the 1999 Toyota Sienna
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology