Ecko508

iTrader: (2)

Car is at the dealership now, I'll keep you posted on what transpires

Ecko508

iTrader: (2)

Verdict is an exhaust leak on both sides of the Y pipe. Anyone installing the ARK exhaust I recommend buying new OEM gaskets for the Y pipe before installing!

cp2

iTrader: (1)

did you get a cel after replacing the gaskets?

Ecko508

iTrader: (2)

Yup just came on again saying bank 2 too lean

proview3r

What if the check engine light is on and it happens to be the gas cap not tighten? Even though I tighten it, the check engine light is still there...

StevenLiu

someone told me it was normal for it to come up but you don't have to worry about it.

Ecko508

iTrader: (2)

Don't think it's normal for a car with 8k miles haha! Now saying bank 2 too lean and port injector fuel system , going to replace the other O2 sensor I guess and see what that does otherwise this is ridiculous

rex2lex

Can you post the actual code and any other info the code reader gives? (the P #). Some times this type of error can be related to a vacuum leak or fuel pressure issue or a bad injector issue.

Ecko508

iTrader: (2)

yes it was p1170 Port injector fuel performance and p0174 Air Fuel mixture system too lean bank 2

Ecko508

iTrader: (2)

from what ive read it seems to be the o2 sensor on the passenger side exhaust before the CAT, i ordered one and I'm going to replace it. i already replaced one side so if this doesn't fix it i don't know what to do. thanks for any help guys!

rex2lex

Here's more info for you:

Should be covered under warranty, whatever it specifically is.

P1170 LEXUS - Port Injector Fuel Performance:
Possible causes

- Faulty Port Injector Fuel
- Port Injector Fuel harness is open or shorted
- Port Injector Fuel circuit poor electrical connection


P0174 Lexus - Air/Fuel Mixture System Too Lean Bank 2
Possible causes

- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection

Tech notes

If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

Ecko508

iTrader: (2)

They are going to try and say it is because of the exhaust, but a faulty injector at 8k miles?

rex2lex

Right, forgot you said you had the ark exhaust. Ya probably not the injector, but I guess you never know. Sounds more like in the tech note since you got both codes. Hopefully the O2 sensor will fix it up.

Ecko508

iTrader: (2)

I'm at my wits end with this exhaust, not sure what's going on but to have two O2 sensors junk in the 6k miles I had the exhaust on is crazy

rex2lex

Ya definitely should not have two sensors go. It's either really bad luck or somethings going on with the exhaust and/or the exhaust install. Maybe the sensors were damaged during install.