Check engine light
Driver
Joined: Apr 2017
Posts: 56
Likes: 22
From: Tennessee
I'll be surprised if it's a bad oxygen sensor guessing your vehicle has less than 80K miles.
According to ARK website, the exhaust is considered "race/off-road use only" since the factory cats are replaced with high flow cats. The high flow cats is probably causing the fault.
Investigate oxygen sensor spacers.
If it's really a bad oxygen sensor, I would stick with OE. Rather spend the time and money once instead of twice if compatibility issues down the road.
According to ARK website, the exhaust is considered "race/off-road use only" since the factory cats are replaced with high flow cats. The high flow cats is probably causing the fault.
Investigate oxygen sensor spacers.
If it's really a bad oxygen sensor, I would stick with OE. Rather spend the time and money once instead of twice if compatibility issues down the road.
I'll be surprised if it's a bad oxygen sensor guessing your vehicle has less than 80K miles.
According to ARK website, the exhaust is considered "race/off-road use only" since the factory cats are replaced with high flow cats. The high flow cats is probably causing the fault.
Investigate oxygen sensor spacers.
If it's really a bad oxygen sensor, I would stick with OE. Rather spend the time and money once instead of twice if compatibility issues down the road.
According to ARK website, the exhaust is considered "race/off-road use only" since the factory cats are replaced with high flow cats. The high flow cats is probably causing the fault.
Investigate oxygen sensor spacers.
If it's really a bad oxygen sensor, I would stick with OE. Rather spend the time and money once instead of twice if compatibility issues down the road.
Driver
Joined: Feb 2016
Posts: 132
Likes: 20
From: Saskatchewan
And I'll finish my reply before posting next time. Lol
Anyway, had this happen twice now. I currently have the RR Racing intake tube with their IS350 tune. After reading up on the faults I narrowed it down to the MAF sensor. Bought some MAF cleaner and I haven't seen it since.
Anyway, had this happen twice now. I currently have the RR Racing intake tube with their IS350 tune. After reading up on the faults I narrowed it down to the MAF sensor. Bought some MAF cleaner and I haven't seen it since.
Pole Position
Joined: Jun 2017
Posts: 201
Likes: 13
From: TX
Driver
Joined: Feb 2016
Posts: 132
Likes: 20
From: Saskatchewan
Originally Posted by Darqhelmet
honestly not surprised. Shut the car off, it’s not a generator so running it just sitting there is going to **** it off.
ClubLexus Stories
Celebrating Lexus & Toyota from Around the Globe
Lexus NX 350h: A Fuel-Sipping Secret Hot Hatch???
Michael S. Palmer
5 Best & 5 Worst Lexus Daily Drivers
Joe Kucinski
Top 5 Hottest Lexus & Toyotas in 2026 (Hardest To Buy)
Brett Foote
2026 Lexus IS 350 F Sport Review: The Last of Its Kind Still Rocks
Michael S. Palmer
Top 10 Most Confusing Things Lexus Has Ever Done!
Joe Kucinski
2026 Lexus ES Review: Lexus Re-Embraces Founding Principles
Michael S. Palmer
10 Lexus Bargains That are Cheaper Than a New Toyota RAV4
Joe Kucinski
8 Weirdest Things Lexus Has Ever Built
Verdad Gallardo
10 Lexus Designs That Have Aged Like Fine Wine
Verdad Gallardo
Pole Position
Joined: Jun 2017
Posts: 201
Likes: 13
From: TX
Nope, but if you think your MAF and O2 senors are made to just sit their with the engine idling feel free. If it’s -40c throw a block heater on it and go inside. You do understand that your are on the extreme or duty maintenance schedule with that type of habit. But everyone can do what they want so have at! I would be angry too if I lived somewhere that was -40c.
Driver
Joined: Feb 2016
Posts: 132
Likes: 20
From: Saskatchewan
Originally Posted by Darqhelmet
Nope, but if you think your MAF and O2 senors are made to just sit their with the engine idling feel free. If it’s -40c throw a block heater on it and go inside. You do understand that your are on the extreme or duty maintenance schedule with that type of habit. But everyone can do what they want so have at! I would be angry too if I lived somewhere that was -40c.
Driver
Joined: Jul 2018
Posts: 159
Likes: 11
From: TX
so if i am sitting idle in traffic for 30 40 minutes it will cause harm to the car or the car wont like it and throw a code and your suggestion is to turn it off?
Pole Position
Joined: Jun 2017
Posts: 201
Likes: 13
From: TX
If you are not moving and altering the throttle input you should shut the car off. You all need to understand fuel tables and what ecu’s do with A/F especially if you’re slapping tunes on these cars. But sure sit there with the car in gear Idling for 40 min not touching the throttle running non stock parts and tunes that screw with the table and wonder why your 02 sensors are getting pissy. Again you all do what you want. I will do what I want. My car doesn’t have codes though.
Pole Position
Joined: Jun 2017
Posts: 201
Likes: 13
From: TX
I am saying he has no idea what was done to his fuel map at idle nor do I but a car idleing has to have fuel pulled out of table due to cams not being efficient at idle. You will run rich stock and who knows (outside of the fact that he is throwing check engine lights tied to emissions) So you’re idleing (running rich and not pulling much air) you have no load ( so min heat being generated ECU dumps more fuel), your cats are not to op temp so they aren’t doing there job. Custom tune which I am pretty sure is a generic flash (if it’s a proper dyno tune please ignore my post) ECU panics because you have pushed to far to one side of the A/F ratio and these cars NOT having a wide band will have a very limited view of what is happening. Dumps more fuel to prevent the valves from getting burnt, coats your plugs and 02 sensors in fuel. Check engine is thrown. Under load and moving you are more efficient and the have mostly pushed everything to operating temps to prevent these things from happening. This is general and the error is logged in his ECU.