I (stupidly) went to the toyota dealership because the check engine light was on. They told me the Diagnosis Code was PO174 system too lean found bank 2 air fuel ratio sensor faulty. Recomended replacing bank 2 a/f sensor. They told us if this doesn't get fixed it can cause major problems with the catalayic converter
We didn't have anything done but when we got our car back the light was off and hasn't come back on again. A mechanic we know personally, told me they might be giving us the run around, and a lot of times the sensor just needs to be cleaned.
Is this something complicated to do, does anyone know how to do this?
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Re: Diagnosis Code PO174
Before replacing parts i always like to clear the code and see if it comes back .
there could be a fluke that set the code or poor fuel could also cause this code.
i would continue to drive and see if the code comes back and if it does find a independent garage and get a second opinion. and just play dumb and see what they say.
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
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www.toyota-4runner.org/.../4164-check-engine-light-vsc-trac-trac-off-li... Jun 6, 2004 - I just bought it, and a few days later the check engine light, VSC TRAC, and TRAC OFF lights all came on. I took it to a dealership and was told ...
When a 'check engine light' (MIL=Malfunction Indicator Lamp) is turned on, there is a DTC (Diagnostic Trouble Code) set/stored in the ECM/PCM (Engine Control Module/Powertrain Control Module). This code identifies which engine management system component/function experienced a malfunction. Once you pull/read this code, you may begin diagnosis.
A code P0400 may mean that one or more of the following has happened:
• Plugged EGR passage which restricts the flow of exhaust gasses
• Faulty EGR solenoid
• Faulty EGR solenoid wiring/harness
• Vacuum lines damaged/disconnected to the EGR valve solenoid or to the EGR valve
• Faulty EGR valve
If you can post the exact code that was read with the check engine light it may help with diagnosis. Toyota sensors should be replaced with Denso brand. Many other brands can create problems with Toyotas, especially Bosch.
I had the same problem, then took my car to an expert repair shop who diagnosed the sensors and
found no problem with the car. They notified the DMV who was unaware of the problem, who then told the repair shop (John's Bascom Automotive) that they will adjust their computer system to allow a "two speed idle test". My bill was $95 and I still have to pay for a smog test after driving around for
a couple of days to clear the computer monitors, a fair amount and I gladly paid it.
John advised me that I'd get no satisfaction with Toyota or the DMV. I went to the dealership where I
bought the car and they said that the smog stations don't know what they're doing. They charge
about $100 and work around the P0500 code but it takes them about two hours to do this. I told
them that I should have been notified about the dyno none-compatability by Toyota and that Toyota
should have notified the DMV beforehand. I wonder how many speed sensors are being replaced by
unknowing smog shops around the state. I got Toyota's main customer support phone number and
will call them Monday. I'm going to get my pound of flesh ($95 worth) from the DMV next week also.
My '06 Corolla's CHECK ENGINE light came on the other day and then went out after about a half hour. It was back on this morning and stayed on, and I noticed that the automatic transmission was shifting a bit more roughly than it ever had before. Took the car to a Toyota dealership immediately. The guy told me that Toyota has had an ongoing problem with the CHECK ENGINE light coming on due to a faulty CPU (car's computer "brain"). This has been affecting models from '05, '06, and '07 according to him. He said Toyota had extended the warranty for this particular part (i.e. the CPU) due to it being faulty. The warranty expires once you reach 80,000 miles, and my car has 87,000 miles on it (yes, I do drive that much for my job!). But the guy at the dealership was kind enough to put in a new CPU for free because I have been a good, loyal customer there. The CHECK ENGINE light is now off and it should stay that way.