The Lemon IndexB1801 is a manufacturer-specific code, so its exact meaning depends on the make. Full B1801 page
10 owner complaints · the #2 code Toyota RAV4 owners name · 12% of Toyota RAV4 complaints that name a code (every car: 0.1%)
Middle of 73,000 miles · most between 66,000 and 87,000 (9 owners gave it)
Toyota RAV4 owners named B1801 in 10 complaints to the U.S. government (NHTSA), most often on the 2007 and 2008 model years, at a middle of 73,000 miles. Complaints are owner reports, not proof of a defect.
Toyota RAV4 model years that report B1801
Owner complaints naming B1801, by model year. Raw counts: years that sold more get more complaints, so this is each model year's record, not a failure rate.
Mileage when it happened
73,000 miles is the middle of what 9 owners entered. Half were between 66,000 and 87,000 miles.
The mileage on the complaint form, when the owner gave one.
Symptoms owners describe with B1801
10% of these complaints say the check engine light came on.
Keep going
- B1801: meaning, causes and every car that reports it
- Toyota RAV4 reliability by year
- 2007 Toyota RAV4 problems and recalls
Other codes Toyota RAV4 owners report
The details
How we count
We read every owner complaint in the NHTSA file whose text names this trouble code, and count the ones filed about this model (matched by the make, model and model year on the complaint). Mileage is what the owner entered on the form.
Parts: a complaint counts for a part when one of the owner's own sentences names that part together with a cause word (failed, bad, diagnosed, caused by, leaking ...) or a repair word (replaced, repaired, new, reprogrammed ...). "Came back" means the same complaint also says the problem returned or the repair didn't fix it. These are counts of what owners wrote, not a diagnosis, and one complaint can name several parts.
Complaints are reports, not proof of a defect, and most owners never file one. Popular models get more complaints, so the counts are not a failure rate. The code meaning is the standard SAE J2012 definition in our own words, or the carmaker's meaning where we verified it for that make.
What B1801 means
B1801 is a manufacturer-specific code: each carmaker decides what it means, so the same code can point to different problems on different brands. We haven't verified its meaning for Toyota yet. A dealer or a scanner with the maker's software can tell you exactly.
Check the complaints yourself
NHTSA complaint numbers (search them at nhtsa.gov): 10660745, 10579470, 10543655, 10533100, 10531941, 10524353, 10493575, 10470667, 10458481, 10430364.
Quick answers
Which Toyota RAV4 years have the most B1801 complaints?
In complaints to NHTSA, owners of the 2007 (8), 2008 (2) Toyota RAV4 named B1801 most (10 complaints in all, 2007–2008). Raw counts, not a failure rate.
At what mileage does B1801 show up on a Toyota RAV4?
Owners who gave their mileage reported a middle of 73,000 miles; half were between 66,000 and 87,000 (9 owners).
Sources: NHTSA owner complaints that name B1801 on the Toyota RAV4, counted by The Lemon Index; NHTSA recalls; repair bills owners named. Meanings: SAE J2012 in our own words. Owner reports, not a diagnosis or repair advice for your car.