Bad ECU on 1999 4runner
#1
Bad ECU on 1999 4runner
My check engine light turned on and I had the codes read at a dealer. The codes said that my front 02 sensor was bad. Replaced the sensor and reset the code. Light came back on again and now the code is saying that the sensor is over heating. The dealer is saying my ecu is bad and they want to replace it for $1200. Does this sound right?
MAF sensor was replaced also.
MAF sensor was replaced also.
#2
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just take in a bottle of vaseline to them before they charge you for a new ecu......stupid dealers. Why is it that people dont go get 2nd or 3rd opinions? jeez.
#4
I would get a second opinion before you drop $1200. Dealerships love to "parts swap" instead of diagnose the problem correctly.
I have seen this problem before in vehicle, and the most common problem seems to be the catalytic converter. That is also an expensive option, but personally I would rather fix one spendy problem than throw $1200 uselessly at a truck and still have a problem.
In my experience working at this wrecking yard, in 9 years I have never sold an ECU for a 99 4Runner, and have zero calls.
I have seen this problem before in vehicle, and the most common problem seems to be the catalytic converter. That is also an expensive option, but personally I would rather fix one spendy problem than throw $1200 uselessly at a truck and still have a problem.
In my experience working at this wrecking yard, in 9 years I have never sold an ECU for a 99 4Runner, and have zero calls.
#6
Thanks for the help! The exhaust smells like rotten eggs so I think it is the CAT. I have been searching all over the web for information on a bad ECU and can find very little resources. Truck is running fine but I need to get an emissions test for new plates here in Colorado. It won't pass with the light on. If I change the CAT what do you guys suggest for a new one?
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#8
Thanks for the help! The exhaust smells like rotten eggs so I think it is the CAT. I have been searching all over the web for information on a bad ECU and can find very little resources. Truck is running fine but I need to get an emissions test for new plates here in Colorado. It won't pass with the light on. If I change the CAT what do you guys suggest for a new one?
#9
Well... just got back from a second dealer that had a look. They were more informative regarding the issue. They tested the wiring from the 02 sensors back to the ECU as the only reason the 02 sensors would be heating up (both front and rear) and have a code is if the wires were grounding out. The wires are fine. They suspect the ECU is also the problem because it is not normal for both 02 sensors to have the same heating code. They said that each 02 is on a seperate driver on the ECU. Advice???
#15
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Join Date: May 2007
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hope this was not the same part number...could have saved a boatload of cash looking over on Marketplace
https://www.yotatech.com/forums/f109...5420-a-213196/
https://www.yotatech.com/forums/f109...5420-a-213196/
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