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I have a 2006 Tundra 4 door 4x4. I have swapped out the original 4.7 with another 4.7 (same year). However, it is giving me the following codes:
0121 - throttle position sensor, 0123 - throttle activity sensor high voltage, 0113 - intake airtemp high input voltage, 0412 - air injection system air switch valve, 0102 - air mass flow sensor low input voltage, 2135 - O2 sensor pre-converter.

The local dealer wants about $4000 to fix. I'm thinking these are a symptom of another issue - possibly a defective computer. Any ideas?

Thank you in advance.
 
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