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2001 Lexus RX300: check engine light..vsc light is on..p0171, & p0174…

Customer Question
I have a 2001 Lexus...
I have a 2001 Lexus RX300 3.0 liter. The check engine light is on and the VSC light is on. The codes present are P1130, P1150, P0171, & p0174. No ABS codes are present. HELP
Submitted: 10 years ago.Category: Lexus
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2/17/2012
Lexus Mechanic: Ron Z., - Lexus Tech - replied 10 years ago
Ron Z.
Ron Z., - Lexus Tech -
Category: Lexus
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Experience: 18+yrs experience. State Inspector and Lexus Diagnostics
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Welcome to JustAnswer.com! My name is DriveFast71(Ron) and I will do my best to answer all of your questions completely and accurately.


When the Check Engine light comes on, the VSC/Trac light(s) are also set, which turns these systems off. This is a self-preservation mechanism, in case the reason the Check Engine Light is on can harm or effect the VSC/Trac systems. So- fix the reason why the Engine Light is on, and the VSC/Trac system(s) will come back online.

These 4 codes are actually related. The P1130 &P1150 are pointing to faults in the A/F Sensors (aka Oxygen Sensors) for both banks. Not very common for both A/F's to fail at the same time. This is where the P0171 & P0174 come in. These codes are pointing to the system running "lean" on both banks. When all 4 of these codes are set together, the common factor on these vehicles is a faulty Mass Air Flow Sensor. Inspect the air cleaner ducts and check for any holes, cracks or loose connections. Check the Air Filter and make sure it's not excessively dirty, limiting air flow. If these check out, suspect a faulty MAF.
graphic
Ron Z.
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Customer reply replied 10 years ago
I checked all the duct work, cleaned all hose connections, new clamps and lubricant on all hose connections and made sue the clamps were tight. I installed a new MAF sensor, drove the vehicle 4 miles, cleared all codes. I drive another 4 miles and the codes were all back.
Lexus Mechanic: Ron Z., - Lexus Tech - replied 10 years ago

Ok- Make sure the MAF sensor you bought was of "better quality" - if you got this MAF at AutoZone, theres a strong chance it doesn't meet Lexus specs, and/or its defective.

 

If the MAF is known good, then next we need to look at a few other things, focusing on the P0171/174, as the faulty Oxygen Sensors are a by-product of the engine running lean. It's extremely rare both A/F sensors fail at the exact same time.

 

Start by checking for a clogged fuel filter, and intake air leaks. If those check ok, below is a list of possible causes:

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Customer reply replied 10 years ago
The MAF I bought was NAPA (Ecklin). It was reman. All the products I have bought from NAPA have been 98% good. Is there a way to check the MAF?
Lexus Mechanic: Ron Z., - Lexus Tech - replied 10 years ago

Ahh. Not a big fan of reman, especially on Lexus. There is a test procedure, it requires the use of an Ohms meter:

 

  1. INSPECT MAF METER RESISTANCE Using an ohmmeter, measure the resistance between terminals THA and E2.

If the resistance is not as specified, replace the MAF meter.

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