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[walter]

Hi! 2 weeks ago a customer came to me for replace a o2 sensor, i installed a B18C4 (B18C1 in US) into his EG5 , everything was good, the weird problem is that when i tried to install a universal NTK o2 sensor, solid cel and car didnt start it up..main relay doesnt works.., tried a oem o2 sensor, same problem, only works good with the o2 sensor that he has installed, i tried to remember when i did swap, it worked as normally, even without o2 sensor startet up, i dont know what the hell he did in his car.. only withs with that universall o2 sensor..any idea?

[walter]

btw, tried my ecu, made another basemap with o2 dissabled, samething..didnt start with solid cel..what the f..

[HiProfile]

Did he some how use the main relay ground re-routed to the added o2 sensor, then mess with the sensor wiring? Try jumping each of the o2 plug's ground wires to ground, then both, then checking if the other 2 wires have continuity to ground (shorting out).