03 Galant Engine Light On, P0135 & P0740, Seeking Advice... - Mitsubishi-Forums.com
 
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post #1 of 8 (permalink) Old 07-31-2011, 03:21 AM Thread Starter
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My 03 galant engine light went on for a while before I got the codes checked from Autozone. Did not expect to get two codes. Would really appriciate for any clues or suggestions about the two codes.

Code 1. P0135, heated oxygen sensor, bank 1, sensor 1. For this code I think I'll have to test the oxygen sensor. My question is where it is located. From what I checked, sensor 1 should be the one that I can see easily when opening the hood, just in front of the engine and pops out. Is that right?

Code 2, P0740, TCC system malfunction. For this problem I really don't have much clue. I would really want to know how severe the problem is. is it just lowers the gas mileage or it can lead to other more serious damage to the transmision or other parts?

Any useful information is greatly appreciated!!!
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post #2 of 8 (permalink) Old 07-31-2011, 12:58 PM
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Oxygen sensor 1 ( yur car onlee has one bank since its a 4cyl) is the sensor on the exhaust manifold right above the exhaust manifold mounted catalytic converter . When yu have a code they usually have failed. Yu will waist yur time checking. If yu do not kno where its location is im not sure yull kno how to accurately check it, The heater element has likely failed in it which is common.

TCC (Torque Converter Clutch) meaning the Torque converter clutch is either likely not engaging , or partially engaging . Or the circuit is staying stuck defaulted on it. This can be due sumtimes to severly old transmission fluid , or low fluid levels restricting pressure for proper TCC operation.

Yu should change yur transmission fluid , and hopefully it may aid in correcting the situation. Otherwise yu may also be having an issue with the torque converter

You Look Like I Need Another Drink
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post #3 of 8 (permalink) Old 07-31-2011, 01:15 PM
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if u have a 4cyl engine then yes its the upper sensor...

if u a have a 6cyl engine...
bank 1 is the bank with cylinder number 1 in it....

but again sensor 1 is the upper sensor

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post #4 of 8 (permalink) Old 07-31-2011, 04:38 PM Thread Starter
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Thanks a lot KiT TeUnG 2549 and SRSONE. I am now pretty sure where this sensor is and going to have it replaced. It haven't been changed after I bought this galant back in 2009, when it has 103000 miles on it.

For the TCC code I am also considering changing transmission fluid, although this galant still drives good and did not show abnormal gearing when I accelerate to 60 mph. However from what I checked online it seems that changing transmission fluid is not something that you can do without a garage and tons of special tools. So I wonder if you guys have an idea how much would it cost to have this job done in a service shop??

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post #5 of 8 (permalink) Old 07-31-2011, 08:27 PM
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a full system flush..
probably between 140 to 180$....


and only use mitsu tranny fluid.....


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post #6 of 8 (permalink) Old 08-01-2011, 05:39 PM Thread Starter
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<div class='quotetop'>QUOTE (SRSONE @ Jul 31 2011, 07:27 PM) <{POST_SNAPBACK}></div>
Quote:
a full system flush..
probably between 140 to 180$....


and only use mitsu tranny fluid.....[/b]

Thanks again SRSONE!! I'll update how things go after these jobs are done....
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post #7 of 8 (permalink) Old 08-01-2011, 06:54 PM
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also when u clear the codes do a computer reset..clear the memory and relearn the trans..

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post #8 of 8 (permalink) Old 08-03-2011, 05:44 PM Thread Starter
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<div class='quotetop'>QUOTE (SRSONE @ Aug 1 2011, 06:54 PM) <{POST_SNAPBACK}></div>
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also when u clear the codes do a computer reset..clear the memory and relearn the trans..[/b]

Thanks SRSONE.

Alright. Had the fluid changed today. The mechanic told me that the old fluid is 'really nasty'........

For clearing the codes and computer reset, do I need to go to Autozone to do that? I usually disconnect the battery to let the engine light off.
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