You are here:

Toyota Repair/Error P0171, P0174 - will realignment of the steering and suspension resolve the problem


Last week, the check engine lights, traction Control, master warning lights and Check VSC System of my 2008 Toyota Camry XLE V6 came on. There is also a "hissing" sound  from under the steering column when I applied the brakes

I brought the car to auto parts outlet to read the error codes, it came back with a P0171 and P0174. But when I bought it to the mechanic, he did a realignment of the steering and suspension. The lights did went out, but the "hissing" sounds remains. It seems that both codes are not related to the steering and suspension system.

I'm wondering if the root cause was really resolve.

Thank you

Those codes are for a lean/rich fuel mixture and have nothing to do with suspension or alignment, it sounds like there is an intake air leak going by what you are saying about the hissing noise, since this noise happens when the brakes are applied there is a good chance that it has a defective brake booster unit so it should be checked for that by a competent mechanic. The reasons the lights went off is that they cleared the codes in memory, they will return after a while because the real problem wasn't fixed.

Toyota Repair

All Answers

Answers by Expert:

Ask Experts


Ted Ritter


I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for more ten years an have answered over 16,000 questions helping Toyota owners with their problems and save thousands of dollars without any compensation, some of my answers are published on many other websites including google and various automotive forums. DONATIONS ARE VERY MUCH APPRECIATED, IF YOU HAVE RECIEVED HELPFUL INFORMATION PLEASE MAKE A DONATION. AS OF TODAY (JULY 22, 2014) ALL REQUESTED GRAPHICS, ILLUSTRATIONS, DIAGRAMS, PHOTOS, WILL REQUIRE THE MINUMUM DONATION UP FRONT.


Toyota technician since 1979,expert in electrical systems,OBD systems,engine repair, driveability problems,EFI systems,ASE certified,Toyota master technician.
Certified Hybrid Vehicle technician.

Toyota master technician, ASE certified in eight catagories, Hybrid vehicle certified. Toyota technical training: Engine Automatic transmission Manual transmission Drivetrain Electrical systems Brakes and chassis Air conditioning Engine performance and diagnostics Hybrid systems

©2017 All rights reserved.