I took my car to autozone today to get my CEL scanned since it's always been on the whole time I've had the car. He printed out the paper with the codes and there were 10 different codes. They were: P0420 P0430 P0171 P0174 P0335 P0340 P1345 P1350 P0156. Can someone please let me know where to start with this LMAO. I'm okay with doing most of the work myself.

 

Google search- “Toyota OBD code P0420 P0430 P0171 P0174 P0335 P0340 P1345 P1350 P0156” and report back with the results.

 

An investment in the official Lexus repair manual is worth it
https://techinfo.snapon.com/TIS/Register.aspx

or others have discussed one offered by rock auto on cd
https://www.clublexus.com/forums/rx-...rock-auto.html

 

Would be helpful to type what message comes up with each code, because nobody here has them all memorized, and there not much information we can give with a jumble of numbers and letters.

 

P0420 Bank 1 Catalyst System Efficiency Below Threshold
P0430 Bank 2 Catalyst System Efficiency Below Threshold
P0171 System Too Lean Bank 1
P0174 System Too Lean Bank 2
P0335 Crankshaft Sensor Circuit Malfunction
P0340 Camshaft Sensor Circuit Malfunction
P1345 VVT Sensor Range/Performance Problem Bank 1
P1350 VVT Sensor Range/Performance Problem Bank 2
P0156 Bank 2 Sensor 2 O2 Sensor Circuit Malfunction

I believe the best first action would probably be cleaning or replacing the MAF sensor, as that could be causing P0171 and P0174 which in turn could be contributing to P0420 and P0430. But at the same time it could be a vacuum leak but I'm 100% sure there's plenty of factors that I'm not taking into account as I'm pretty new to cars lol.

 

Just posted what they all meant. I also think it's probably smart to add that the car runs and the idle is a bit rough but nothing crazy. The only really weird thing that happens while driving is that when i press the gas pedal to the floor, it takes like 5 seconds for it to start moving, but if I ease into the gas it usually speeds up a bit better, but even then if I ease into it sometimes it will lag for a super long amount of time which is pretty scary on highway entrances.

 

Quick Update: Yesterday I cleaned the battery terminals since they were super corroded, like a huge mount on the positive. Today I took the car on a 10 minute drive to the grocery store, and I'm guessing since all the codes the cleared, it was acting up a lot. No problem starting it up but the idle seemed rougher and at first i could barely get to over 20mph and it was jerking back and forth a lot whenever I hit the gas. On the drive back it was considerably better though, I'm guessing since it warmed up and everything started to adjust to the problems?

 

Another Update: I forgot to mention that whenever I press the gas there's immediately a really quiet metal click sound, and the same sound happens as soon as I let go. I tested the battery today and it was working perfectly, but I noticed that the engine seemed to be ticking a little bit, kind of quietly. The MAF sensor was pretty dirty so I'm gonna use MAF cleaner right now and if that doesn't help I'll order a new Denso one.

 

Cats are plugged up…

 

I figured. I was gonna wait to fix them until all the other codes are fixed since it doesn't seem like they could affect any of the other codes anyway so maybe fixing something else will help with those LOL.

 

I downloaded the LS430 Repair Manual offline and have some more information regarding the codes and such:

P0335 Crankshaft Position Sensor Circuit Malfunction
P0340 Camshaft Position Sensor Circuit Malfunction
P1345 VVT Sensor Circuit Malfunction (Bank 1)
P1350 VVT Sensor Circuit Malfunction (Bank 2)
P0156 Oxygen Sensor Circuit Malfunction (Bank 2, Sensor 2)
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0430 Catalyst System Efficiency Below Threshold (Bank 2)
P0171 System too Lean (A/F Lean Malfunction, Bank 1)
P0174 System too Lean (A/F Lean Malfunction, Bank 2)

According to the manual, that's the order that I should take care of them (Crank/Cam sensors interchangeable in place with VVT Sensors as there's no priority, but some people have trouble with VVT due to cam/crank sensors so I put those first to eliminate the chances).

As of right now I think my best bet is to use a multimeter to check: Crankshaft Sensor and Connector, Camshaft Sensor and Connector, VVT Sensor Bank 1 and 2 and Connectors, and all 4 O2 Sensors and Connectors. The manual said that fuel trim codes and misfire codes (which I thankfully don't have) come after all other codes, so besides cleaning the MAF I'll hold off on that until everything else is in order.

Any tips? I'm new to cars still so all of my information could theoretically be completely wrong LOL. This is all based off of a few days of research so I'm sure I made some mistakes along the way.