Hello all,

It's that time of the year again. I got the below check codes. I replaced all the intake gaskets and the injector o-rings a couple years ago. Stayed CL free for a year, but got these codes last year. I need to sort this out before getting it smogged. Any thoughts? Vac leak somewhere?

P0733 - gear 3 incorrect ratio

P0174 - Bank 2 lean

P0171 - Bank 1 lean

 

I'm guessing mass air flow sensor with that incorrect gear ratio coupled with lean codes.

get brake cleaner and spray all along intake and vacuum lines post MAF, if the engine idle changes it might be a leak and not MAF.

 

Thanks Abran. I am also leaning towards the MAF as well. Not sure if I replaced it when I bought the car 3 years ago. Got a OEM Bosch on order with NAPA. If that doesn't solve it, then I'll move to checking for leaks. Never tried the propane gas trick but I'll give that a go.

 

Just to clarify, I suggested using brake cleaner, not sure if that has propane gas in it.

good luck

 

Yes, I know you didn't suggest it. I just heard using propane gas works as well.

 

Replaced the MAF with a new Bosch one. Reset the CL and it's staying off for now. Just need it to stay off while the system gains the time to be ready to smog.

 

Passed smog! Had it hooked up to my OBD reader to monitor once it was ready, then went straight to my local smog guy. Nice not to see that CL everyday.

 

Glad that fixed you up, but if you're waiting to fix issues because of SMOG and not because your truck is having an issue it's not going to live long or be reliable for you. Especially with an issue like running lean. That's terrible for your engine.