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Previa - Loss Of Power And Engine Warning Light


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#11 propnut

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Posted 02 April 2008 - 02:14 PM

Excellent, glad it got fixed. Can you please confirm for the other guy who asked whether or not is was the Lamda sensor or the Air Flow sensor. The Lambda sensor is the one on the exhaust header pipe and is a long cylindrical thing with 3 or 4 wires coming out of it.

Black oil is never a good thing in an auto box. I would still have that changed if I were you.

All the best.

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#12 Mr.Spoons

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Posted 03 April 2008 - 11:07 AM

As I understand it it was the Air Flow sensor, "Fault Code P1135 A/F Sensor Bank 1 Sensor 1" is what is printed on the receipt.

Thanks for your help.

#13 propnut

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Posted 03 April 2008 - 03:55 PM

Great many thanks for confirming this, they have misinterpreted the meaning of the F. The Lambda sensor role is to detect the presence of free oxygen in the exhaust gases which will exist in the correct proportion to volume based on the correct AIR/FUEL ratio. If it detects that that this ratio is too lean it tells the ECU which richens the mixture, if it detects that the mixture is too rich then accordingly the ECU leans out the mixture. Nominally a lamda of 0.9 - 1.0 should exist. For some reason Toyota has chosen to refer to the Lambda sensor as an A/F sensor which can be confusing if one doesn't realise that they are one in the same.

This is just for the reference of others reading this, the important thing for you is that your problem has been rectified.

#14 moffball

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Posted 16 April 2008 - 10:16 PM

[quote name='propnut' date='Apr 1 2008, 08:54 PM' post='738164']
That code is actually P1135/21 and is the Air/Fuel Heater circuit malfunction bank1 sensor 1

Propnut.
You speak more sense than anyone I've asked thus far so forgive me for jumping in with a question. I drive an Estima 2.4 Auto which I imported on a 2000 W last summer (2nd generation - ACR30). Whilst I experienced some early engine hesitation which I put down to the effects of a drained tank for shipping, the addition of Redex every 4 or 5 tanks seems to have cleared that with a strong performing engine since particularly round town. However, my check EM light has started coming on at around 50mph and the diagnostic I got was lean fuel mix - no code given. Could this be the same problem as Mr Spoons or could it still be related to fuel flow? I have looked at purchasing diagnostic software and an OBD conector for my laptop - is this worth it (about $150 from US)?
Regards,
moffball

#15 propnut

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Posted 17 April 2008 - 03:44 PM

It is very difficult for anyone to ascertain exactly what is wrong without seeing the car. All one can do is hazard a guess based on the reported symptoms.

So a question for you----if there was no code how exactly did whomever gave you that diagnosis arrive at that conclusion?? I think you really need to get the code from the ECU to ascertain what it thinks is going wrong and then go from there. An OBD scanner is definitely worth its weight in gold as far as new cars go but you should note that there are a number of different protocols and different ones in the US and in Europe. Ideally try and get one that covers as many as possible and is updateable. There are a number for sale on Ebay right here in the UK.

Lets assume for a moment that the diagnosis was correct and you are running overly lean. The ECU would be getting this info from the Lambda sensor and should be trying to rectify it by richening the system. You say the engine is running fine but have you noticed any major change in fuel consumption. If the ECU was constantly receiving a lean condition and was constantly trying to compensate I would say you should have noticed lower mpg by now.

Now if adding Redex to your system alleviated a missing chances are this may be being caused by a sticky injector, problem is the redex could well be coating your Lamda sensor causing it to send erroneous info back to the ECU.

Again this is all just supposition, start with the code and lets go from there. You could use the test procedure I have outlined above to test your primary sensor which should be found at the top of the first cat closest to the exhaust header. As always if you choose to do this it is entirely at your own risk. A perfectly good sensor can be damaged if not treated correctly.

#16 SensorSavvy

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Posted 10 June 2008 - 01:10 PM

I have had very similar problem with Previa 2.4 X reg. 78000miles. The Toyota dealer initially diagnosed oxygen / fuel sensor problems (based on reported error codes) and replaced both of them (there appears to be one either side of the cat apparently) and also the cat, which was all carboned up. This didn't solve anything so they had to get a special diagnistic tool in from Toyota (probably Japan judging by the time they have taken almost a week and the car is still not fixed) and now say it is in fact the air / flow sensor that is also gone.
Does anyone know why these sensors (which seem very expensive for what they are) seem to be very unrelaible or is this a design feature to generate revenue for garages ?

#17 Alan Harrison

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Posted 19 June 2008 - 05:55 PM

My W 2000 Previa was recalled last week and they changed 4 engine coils. Unusual for a seven year old car. Now the engine management light that's been on and off for the past 6 years (mostly on) is off all the time. Probably just coincidence!

#18 L444HOR

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Posted 04 July 2008 - 08:40 PM

Hi!

Just bought a Previa 02 diesel with 132,000 miles. All was fine when i bought it but now suddenly had lack of power going up-hill and didn't want to rev above 2500 revs. It seemed to have lost its umph! when pushed hard.

I cleaned the mass air flow sensor located directly behind the air filter box in the air tube to the turbo and hey presto....It goes like a rocket now!

Hope this helps you guys.

#19 geoff@tnrradio

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Posted 07 July 2008 - 11:26 AM

i wonder if that could also make the turbo over boost as if that sensor isn't working right then it must affect the air flow to the turbo which surely would make the turbo work harder than it would normally and then it dips out .

#20 bilal aslam

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Posted 03 September 2008 - 05:05 PM

hi every body my first time here got a few questions about my previa 52 2003 plate d4d .what happend is i was on motorway and the turbo gave in iimmediatly stoped the aa came they said its the turbo so i got a recon for 650 had it done by a good local guy drives ok on straight road but up hills boy is it struggling had diognostic done now it says air flow meter .because the turbo went there is oil in the exhaust pipe system could yhat be a reson aswell so all of the guys like propnut and anyone who knows somthing they can shed some light on this poor soul all info welcom thanks to all please reply

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