Have Toyota Questions? Ask a Mechanic for Answers ASAP
Hello, I just saw this post, thanks for requesting me
I didn't see a year or model listed in your post, please provide that information and also what engine it has.
any codes besides the lean/rich conditions? Any misfire codes?
In most cases the misfires will cause these codes to come up due to the air/fuel ratio sensor's reaction to the overly lean mixture. Has anything been replaced to try to eliminate the misfire?
Yes, I'm still here
Please give me a moment to respond
Do you have the misfire codes that the dealer had, the misfire is the first thing that has to be dealt with.
I understand but I would like to have the actual code number so I can determine which cylinders are affected, also the Po171/174 codes should have a bank one or bank two designation You can get the codes read at most any auto parts store like Autozone for free, if it's not that urgent it can wait until Monday.
The oxygen sensor is not the problem, how does the engine idle right now?
Does it seem to run normally , is there any loss of power?
Ok, thanks, ***** ***** air/duel ratio or oxygen sensor is their standard answer which in most cases is wrong, since both banks are affected there may be a vacuum leak, have you checked for any vacuum hoses that may be disconnected? Is the air intake hose from the air filter to the throttle body on and no loose clamps? Try replacing the MAF (mass air flow sensor) it's the most common cause for these codes.
I don't think it would cause the problem, check the pcv hose coming from the valve cover near the firewall to the intake chamber, check the other large hoses that connect to the intake and the air filter housing.
And if you can't find anything there replace the MAF sensor.
Ok, got that, let me get back to you in a moment.
There is a toyota service bulletin for those codes which is what the dealer went by, I will have to look into this a little more and see if I can come up with some more info and get back to you, are you sure you put in the gasket between the valve and the intake body?
The vacuum hose coming from the air intake control valve goes to a vacuum switching valve located under the engine cover, the vacuum applied should change with throttle position and rpm, check to see if vacuum is applied from the hose of the VSV to the AIC valve when changing engine speed, if not the vsv may be defective or disconnected.
Toyota Camry: Intake air control system (1MZ−FE/3MZ−FE ...
Click on this link for some good information
Thanks, ***** ***** sure
20 Dec 2015, 10:57 AM