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P0171 Nightmare

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Old 10-02-2018, 04:12 AM
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So I feel like i've read everything there is on the subject over the interwebs. Long story short, gradually i've been getting an intermitted p0171 check engine code with the VSC and traction lights. It would happen while the car would be idling at a stop light then later go away. I do experience weird idles sometimes, for example, sometimes if I have AC blasting at a stop sign my engine might dip to like 600-700 rpm before shooting back up to 1-1.2k. The car has never died on me. Furthermore, sometimes when I floor it I notice a little lag (1-2 seconds) before I feel like the engine really pull. I've replaced the upstream O2 sensor as well as the MAF sensor. Next course of action I believe I will replace the fuel injectors. I've checked for obvious airleaks but I see nothing. Any other ideas?
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Old 10-09-2018, 02:27 AM
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Well, I managed to fix the code. I went ahead to change out the injectors and that seems to have been the issue. I've since put on another 150 miles after resetting the code and it hasn't come back. Usually the code would be coming back within ten miles. Hope this helps someone.
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Old 10-09-2018, 09:11 PM
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Keep us posted as to whether or not the codes come back as this might prove to be a fix for someone else farther down the road, so it's always nice when people take the time to list fixes they've found.
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Old 10-12-2018, 03:27 PM
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I know it's a different car but still a Toyota.
I've been battling this code on my sister's car for years.
So far in the last 4 years I've replaced all the vacuum lines, PCV valve, intake gasket, TB gasket, 02 sensors, injectors, fuel pump, engine temp sensor.
Still the same symptoms and code as yours persist.
She's gone to 2 mechanics and they couldn't find the problem.

At one point it got worse and I changed the air temp sensor on the airbox.
It ran much better but the original P0171 code and hesitation persists.



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