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sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 23100
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Regarding code p2121 Toyota avalon
, replace the pedal

Customer Question

Customer: ***** ***** regarding code p2121 Toyota avalon
JA: Thanks. Can you give me any more details about your issue?
Customer: replace the pedal senor about a year ago on a 2006 Toyota Avalon have not hade any trouble until today same code came back I checked the etcs fuse to make sure it was not burned and all the connections its all good
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Submitted: 1 year ago.
Category: Toyota
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

The accelerator pedal positions sensor contains two internal sensors which create signals based on throttle angle, working at different voltages for redundancy. This code sets when the two signals do not agree with each other.

This could be the sensor itself, wiring or connections, or possible the engine controller. The most likely cause would be the sensor, followed by a wiring or connection issue.

The easiest thing you can do is check connections at the sensor. A connection issue isn't that likely but possible.

If no problems are found then the sensor wiring would need to be tested at the time the code is active and engine is in limp in. The problem could be on the sensor ground, reference voltage or signal circuit for either of the two internal sensors. If the wiring tests good at the time the code is active then the sensor assembly can be condemned and replaced again.

Customer: replied 1 year ago.
i checked all connections and even replaced the sensor again and drove the car had no issues yesterday but this morning the code came back again at a cold start
Expert:  sprinkles08 replied 1 year ago.

If the code is still setting with another factory replacement sensor then you have a connection, wiring or engine controller issue. If you're positive there is no corrosion, terminal fretting or spreading then it's going to be wiring or the ECM.