Hi, I wonder if anyone can offer any advice on this one.
My 2000 Yaris (32000 miles) failed the emmisions test and the garage which carried out the MOT test(I'm in the UK) suggested I take it to a Toyota dealer.
No engine loght had come on.
After "looking" at the car they suggested first trying to change the oxygen sensors (2) as that was the cheaper option and secondly if that didn't work changing the catalytic converter.
I couldn't believe this amateurish diagnostic approach and said surely there must be a way of testing the sensors.
Do you just idle around with the car? Cause if you do take it out on the freeway and open it up and clean out your engine, even by dropping a gear and going the posted limits will help. The other thing is your Air Filter clean/new, cause if not that will change your rating same as the spark plugs. There are alot of over looked things that people need to do before they go in for a test.
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My Cars, 2006 Corolla CE, 2003 Corolla LE
obviously the emmissions standards are different in every country and even from state to state here in the US. But the pass fail limits are normally the same for every car. At least here in the state I live in they are. make sure you ahve done your tune-up work to the car including an oil change. I worked for Toyota dealer here in the states and people would come inthat failed their tests jsut barely and we would change the oil and it would pass with flying colors. Like someone else said make sure you drive it on the highway. Get it nice a hot run it farily hard. Even the testing centers here in my home state will tell you to drive it for at least 15-30 minutes before bringing it to the testing center to make sure it is hot.
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Chris
PLEASE DO NOT GET RID OF THE OLD TN AS WE KNOW IT.
I don't understand the Lambda thing, whatever it is. But, I can tell you a little secret to pass an etest.
Put a lot of methyl hydrate (you can find that in the paint section of your home depot store) in your gas. I mean, pour a gallon (4L) in your gas tank, with something like half a tank of gas. Then go beat the crap out of your car for 15 mins. I swear, it will pass the emission test. It will pass so well actually, that the guys testing your car are going to be stunned.
Thats what I do everytime.
However, I tend to exagerate things. So maybe 2L (half a gallon) will do. I wouldn't want to see you harm your engine in any way.
androidGB : when you turn your car on, does the checkengine light (CEL) come one and off (like the other lights). Sometimes just cus of a bad buld, you may assume that the CEL isn't one, but in reality it is on, but the bulb is burnt out. I find it amazing that your car failed emmissions and no CEL came on.
Hi androidGB, please follow the recommendation of fellow members to take your car for a good run shortly before taking it to the test site. Moreover, please do not switch off your engine after the run and before the test. Just keep it running. Bad emmission usually comes out when you first start the car. So, if you switch off your car after the run and restart it only before the test, the emmission numbers will not be good.
they need to change the engne size for you. It will change the "allowables" on the test, might make it easier to pass or even worse. And make sure the car is warmed up real good before you take it for the test. About 90% of the time it will be the oxygen sensors if the CO reading is high. Do they run the car on a dyno, or do they just take the rpm's up?
Basic fault finding for advanced emission test failures:
If a vehicle fails for high CO at idle and /or fast idle then.... if Lambda is too low, the mixture is too rich. This can be caused either by a misfire or by a faulty Lambda sensor. If it's running very rich, the 02 and HC will be higher than normal.
if it has a high Lambda and high 02 (0.5 to 1.5%), the "CAT" could be faulty. Before condemning it make sure its hot enough to work, the Lambda and other sensors are working OK and the exhaust downpipe hasn't got any leaks.
if the vehicle fails for high HC then ...if the CO passes, the vehicle is probably misfiring. Or if the CO fails and the Lambda reading is too low, the mixture is probably too rich and it may also be misfiring.
if the CO fails, the Lambda reading is high and the O2 reading is high (0.5 to 1.5%) the "CAT" could be faulty. Again check out the simple measures above before condemning it.
if the Lambda fails then...if its too high the Lambda sensor may be faulty, the mixture may be too weak or there may be a hole in the exhaust downpipe. If Lambda is too low the sensor may be faulty, the mixture may be rich or the vehicle may be misfiring.
Have you failed the emmissions test only marginally? Chances are if you have barely failed to meet the standards set for a 1.0, you may have already met the standards set for a 1.3. IMHO, a second test may not even be needed. But forgive me, I hardly know the rules in your city. However, if checking it out can save you another test, why not try?
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