HellRaiser1st

Hello, I recently had my mot on my 12 plate gt86, it failed the mot only on the emissions hc test with high readings. Toyota said its my o2 sensors or cat, the cat was replaced recently under 500 miles both of them and the o2 sensors dont show a cel light. I had before broken sensors on car and every time i had cel light same for the cat. My problem is that my mpg got really good its about 37-37.5 this is showing in the milage i am doing and how much of my fuel tank is gone and im not driving slow. I get at 80-90 mph a mpg around 40 plus. I am really puzzeld i mean a broken sensor could increase mpg instead of making it worse? I never heard anything like this. Im gona take the sensors off today and give them a petrol bath to clean them over night. If anyone had similar issues and can bring some insight into this it will be much apreciated. The car has 87k miles, mods include dual cach can (removed at the moment as i tought that is the cause of failure by leaking vacum somehow) and cosworth billet power blocks witch are still on the car. The car is a bit rough at iddle, i had one failed coilpack withlch i replaced., Im planing to replace spark plugs as well. Fresh oil change at 86k millers nanotech fully synth oil same spec as oem one.

i used them a lot as i mostly drive at night and i never use the high beam as my eyes adjust easier to oncoming traffic lights if i stay on low beam and foglights instead of high beam. also the oem ones were quite yellow the led ones are as white as the headlights so it looks better as well. i've seen some people having problems with the clutch sensor, but that still does not explain the ecu fuse blowing every time.

i know, toyota is puzzled as well. I heard of some frs cars in the US having problems similar after installing led fog lights but toyota keeps saying its on a different circuit the ecu and foglights... so i don't know what to make of it, warranty will cover it but i miss my car 2 months now have past

Hi, I own a gt86 for a year and a half now and i had no problems with it until 2 moths ago. I went to the dealer to get some new tires as they had an offer 3 tires + 1 free i parked the car went inside, ordered the tires the mechanic came to move the car and the car would not start. everything was working battery power to fuel pump dash, headlight... just the starter would not kick in. they had it in the shop for 2 months now and cant figure it out apparently my ecu and remote entry ecu fuse keeps blowing, resulting in frying my original ones. They replaced mine under warranty but it keeps happening again when they tested it. Toyota Mechanics believe its a short circuit on one of the wires on the main harness but i doubt it. the only electrical modification related that i done to the car are the fog-light bulbs, i replaced them with LED bulbs same size same dimensions same shape as OEM but LED. Has anyone on this forum ever had or heard of any similar problems on the 86? if so can you give me some pointers as im a bit annoyed now for 2 months they couldn't find it and they are puzzled as to what is causing this issue