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Discussion Starter · #1 ·
Hi guys, looking to install a ECU master black on my umm 4 door supra (jzx100 1jzvvti). Talked to the tuner/dealer in area, he was fairly knowledgeable, but there was one thing I wanted a second option on. He said he only uses the 4.2 wideband sensors as nobody in the aftermarket has really figured out how to control the 4.9 sensors and they will fail prematurely. I think he might of just had one bad experience, but I would like a second opinion from someone on this before buying a 4.2.
 
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