Camry :: 2003 V4 - P0128 Check Engine Light Code


Mar 31, 2008

I'm getting a P0128 code on my 2003 V4 Camry. Autozone diagnosis says it's either

a) coolant low level
b) sensor not working correctly
c) thermostat not working correctly.

As part of 90k mile check about 3500 miles ago, the mechanic replaced the coolant. I didn't check the coolant after he had replaced it but I just checked it today and it's about 1 inch below the full level. Is this normal coolant usage considering that it's been about 3500 miles and 3 months since it was last filled?If the coolant level is okay, then how do I figure out if it's the sensor/thermostat?

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Camry :: 2002 V6 - Check Engine Light Came On While Driving On Freeway / Code P0128

I have a 2002 v6 Camry with over 270k on it. Today the Check engine light came on while driving on the freeway. When I got home I used my scan tool and it gave me the following codes.

P0128, P0440, P0446 and P0440, P0441, P0446 pending.

I understand that the 128 has to do with coolant temp and that the other codes are evap system related.

What I'm trying to figure out is what might have caused them to all occur at the same time. I know once with my 98 Camry it threw a P0125 which had to do with coolant temp issues but it also threw several other codes for a bad 02 sensor and the 125 was just a false code (replaced the 02 sensors and they went away). If this 128 is possibly a false code or if I also have a bad thermostat/sensor on top of an evap system issue.

Also. coolant level is good and I checked the gas cap and insured it was on tight, reset the codes and am waiting to see what comes back.

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2 weeks later all those lights are back again, so my mechanic pulled the code and came up with P0128. He told me it should be the problem with the Coolant Temperature Sensor. The water pump, thermostat was replaced last year and coolant level is OK. No issue with coolant temperature and the car drives like normal. My mechanic cleared the code and told me to drive it again until the lights come back and he will pull the code again.

08 RX350 AWD
08 Avalon Touring

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Elantra XD (2001-06) :: Code P0128 Check Engine Light - Faulty Thermostat

I recently had the engine light come up on my Hyundai Elantra 2003. I read the code with my cheap little code reader with the torque lite (free) app on android. It threw the P0128 code which means a faulty thermostat.

Here's the web link to all the details on the code: [URL] ....

I have checked the coolant level and its good. The strength of the coolant is good to -40 Celsius. The engine fan is not running at all. I recently changed the thermostat. I'm leaning towards faulty ECT. The car takes forever to blow hot air too. It has done weird readings in the past with the temperature gauge in the cab.

I just bought a infrared temperature reader of Amazon and want to check the temperature where the water comes out of the engine past the thermostat and compare it to the reading on the torque app readings. I'm thinking it won't match.

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I keep getting the same code for the check engine light of P0128. I have replaced the thermostat twice and the ECT sensor already. I do know know what else I can do for getting this fixed. I have checked the fans and they are working correctly. I have also checked to make sure there is nothing wrong with the head gasket. My car does not over heat, but it does take forever for the temperature gauge to rise. This is for a 2006 Hyundai Elantra. What else I can do?

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I have an engine code of P0128 (low coolant temp etc.) I now think it's because I no longer have an Engine Splash Shield under my engine and the extra air is cooling the engine. I took it off after backing into a snow bank like an idiot. At first I thought it might be that I poured green coolant into the pink coolant because I lost coolant cleaning the throttle body (120,000miles). This mixture supposedly causes clumping and clogs in the system etc. Since then I flushed the coolant system and replaced it with yellow coolant which popular mechanics said was OK. So I'm left with the question of do i change it again to the pink coolant (~$50 compared to ~$15 for yellow coolant, thats why i got the yellow) or do i get an engine splash guard? Or Both?

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1) open or short circuit conditions
2) poor electrical connections
3) failed oxygen sensor
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I asked how it could be narrowed down and he said it I would have to get the car checked out.

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I am assuming this is the thermostat opening. So, the level is right. The sensor is working and the thermostat appears to open and close. Why its throwing a code?

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Got a 2002 GT with the NA 3.8 and 150,000 miles. The car has pretty much sat for the past 6 months, driven very sparingly. If it's been sitting for a while (like over night or longer) it will start no problem. If I turn the car off for a shorter period, it will crank but not fire. It will start only if I pump the gas as I'm turning the ignition.

In addition, on occasions it has died while at idle or coasting to a stoplight. After it dies it will fire back up no problem.

Fuel problem perhaps?

The "Service Engine Soon" light has been on for about a month before it started acting up. I had the codes checked at AutoZone and it came up with P0442 and P0128.

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P0128 refers to (according to innova).

Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature).

I have replaced the coolant temperature sensor but the codes came back after a few days. I cleared it once again and the code reappeared that same day. I have a thermostat on standby ready to install if the fix requires such.

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