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Discussion Starter · #1 ·
I am seeing a check engine light on since last few days in my 1997
camry V6. I went to local mechanic and he peformed a free scan in front
of me. It is showing up 2 codes P420 and P1780. The mechanic mentioned
following probable problems for these codes.

P420 - Catalytic converter is bad or O2 sensor could be bad
P1780 - Park N. switch could be bad or the car computer could be bad.

The mechanic is saying he would charge $145 just to find out the exact
problem.

Can somebody please guide me how I can find out the exact problem with
spending less $?

Thanks
Mohan
 
G

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Discussion Starter · #2 ·
Besides the check engine light, what problem are you experiencing with
the car?

On Jan 7, 1:51 pm, "Mohan" <[email protected]> wrote:
> I am seeing a check engine light on since last few days in my 1997
> camry V6. I went to local mechanic and he peformed a free scan in front
> of me. It is showing up 2 codes P420 and P1780. The mechanic mentioned
> following probable problems for these codes.
>
> P420 - Catalytic converter is bad or O2 sensor could be bad
> P1780 - Park N. switch could be bad or the car computer could be bad.
>
> The mechanic is saying he would charge $145 just to find out the exact
> problem.
>
> Can somebody please guide me how I can find out the exact problem with
> spending less $?
>
> Thanks
> Mohan
 
G

·
Discussion Starter · #3 ·
"Mohan" <[email protected]> wrote in message
news:[email protected]
>I am seeing a check engine light on since last few days in my 1997
> camry V6. I went to local mechanic and he peformed a free scan in front
> of me. It is showing up 2 codes P420 and P1780. The mechanic mentioned
> following probable problems for these codes.
>
> P420 - Catalytic converter is bad or O2 sensor could be bad
> P1780 - Park N. switch could be bad or the car computer could be bad.
>
> The mechanic is saying he would charge $145 just to find out the exact
> problem.
>
> Can somebody please guide me how I can find out the exact problem with
> spending less $?
>
> Thanks
> Mohan


A Toyota dealer will diagnose the problem without charging you. Most likely
cause is O2 sensor.
 

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Premium Member
Joined
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6,403 Posts
P1780- Short in Park/Neutral switch circuit or bad switch. The computer is detecting the switch is ON during driving or is giving an indication of being in two gears at once.

The 0420 code is stating the converter is not functioning as it should based on the signals from the 02 (or A/F sensors) before and after the cat. The cat could be bad, one of the sensors (02, A/F), exhaust system problem.

The service manual at the link below provides a great amount of detail on these codes. Download the Gen_4, Diagnostics Section. The Toyota dealer should be able to run down the problems using their hand held diagnostics tester.

http://oregonstate.edu/~tongt/camry
 
G

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Discussion Starter · #5 ·
Thanks all. Besides check engine light there is no other problem with
the car. I used the car for about 100 miles after the check engine
light came on and it is still running smooth.

toyomoho wrote:
> P1780- Short in Park/Neutral switch circuit or bad switch. The computer
> is detecting the switch is ON during driving or is giving an indication
> of being in two gears at once.
>
> The 0420 code is stating the converter is not functioning as it should
> based on the signals from the 02 (or A/F sensors) before and after the
> cat. The cat could be bad, one of the sensors (02, A/F), exhaust
> system problem.
>
> The service manual at the link below provides a great amount of detail
> on these codes. Download the Gen_4, Diagnostics Section. The Toyota
> dealer should be able to run down the problems using their hand held
> diagnostics tester.
>
> http://oregonstate.edu/~tongt/camry
>
>
> --
> toyomoho
> ------------------------------------------------------------------------
> toyomoho's Profile: http://www.toyotanation.com/forum/member.php?userid=59151
> View this thread: http://www.toyotanation.com/forum/showthread.php?t=173671
 
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