Check engine light

Tiny
ASEMASTER6371
  • EXPERT
Thats a personal decision.

446 is an evap code.

CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for Canister Closed Valve (CCV), VSV for pressure switching valve are used to detect abnormalities in the evaporative emission control system.

The ECM decides whether or not there is an abnormality in the evaporative emission control system by the vapor pressure sensor signal.

DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components within the dotted line in Fig. 1, or when there is a malfunction in the VSV for EVAP, the VSV for pressure switching valve or in the vapor pressure sensor itself.

Wiring Diagram

INSPECTION PROCEDURE

HINT:
If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440, first troubleshoot DTC P0441, P0446, P0450 or P0451. If no other malfunctions than them are detected, troubleshoot DTC P0440 next.
Read freeze frame data using the TOYOTA hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. At the time of the malfunction.
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
BOB B
  • MEMBER
  • 2000 TOYOTA RAV4
Problem: Check engine Light stays on in warm weather.
Toyota, RAV4, 2000, engine size: 2 Liters, 39,000 miles,
OBD2 Code Reader Indicates Two Error Codes:
1) PO171: System Too Lean (Bank 1)
2) P1130: Air-Fuel Sensor Circuit Range / Performance.
What do I need to replace to fix the Check engine Light so I do not have the check engine light on all the time?

BOB B
e-mail: boburch@juno. Com.
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
SERVICE WRITER
  • EXPERT
First thing I would check for is an air leak such as on the snorkel going to the throttle body. Also check the oil cap, dipstick and pcv valve for proper seating. The first code is probably the result of the second one.
However the strategy is to check the po171 first. It isn't as simple as just replacing a part based on a code as autozone would like you to think.

According to Mitchell 1:


https://www.2carpros.com/forum/automotive_pictures/30961_rav4_1.jpg



Since the problem happens in warm weather. I would lean towards testing the ECT as well as checked the the air leak.
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
JARGREEN
  • MEMBER
  • 2001 TOYOTA RAV4
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 107,000 MILES
My check engine light recently came on in my '01 Toyota Rav-4 (107,000 miles). I took it to Autozone and the error code was P1135 - Air/Fuel Sensor Heater Circuit Response (Bank 1 Sensor 1). It also said that the probable cause was either (1) Open or Short Circuit Condition, or (2) Poor electrical connection.

I've looked at a lot of forums online, and I guess this has something to do with the upstream O2 sensor, on the firewall side of the left exhaust manifold.

What I'm really asking here is, Is this a serious problem? Is it something I need to get fixed right away? See, because of my present circumstances, I don't have any expendable income for the next three months. If it's a repair job costing more than $20, I simply can't fix it. Will my car be destroyed?

Thanks in advance for any responses!
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
RASMATAZ
  • EXPERT
A bad sensor may prevent the system from going into closed loop, and usually causes the fuel mixture to run rich causing an increase in fuel consumption and emissions.
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
STANMARTENSON
  • MEMBER
  • 2002 TOYOTA RAV4
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 13,500 MILES
I have a check engine light constantly on. I took it to the auto parts store who has a gauge or whatever it's called that reads the check engine light. It says that theres a misfire on cylinders 1&2. They say that it's either the spark plugs, coils, or injectors that are bad. I have replaced all the spark plugs and have tswitched coil 1 & 3 with each other and it still reads there's a misfire on 1&2 so I figure that the coils are fine. Do u believe that this anlalysis is correct and that it is indeed the injectors?

Also on a seperate note what is the 4 spark plug looking "things" that are attached to whatever it is just below or in front of the engine block. They have wiring which at the end has a clip that is clipped into another clip. Thanks
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
RASMATAZ
  • EXPERT
Check the compression and injectors for those cylinders
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
JCUTKOMP
  • MEMBER
  • 2000 TOYOTA RAV4
  • 120,000 MILES
My engine light came on about a month ago then a couple of weeks later, I noticed that the car shakes when turning it on. It shakes pretty bad but goes away after I start driving it. It shakes while it is in idle but not when I reverse or drive. I think it is getting worse and feels like its going to stop running.
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Thursday, January 2nd, 2020 AT 8:55 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
The shaking means the engine is misfiring and it is likely the result of ignoring the Check Engine light. When it turns on that means the Engine Computer detected a problem, often before it turns serious, and it set a diagnostic fault code to tell you what that problem is. The place to start is by having the code(s) read and recorded. They will indicate the circuit or system that needs further diagnosis.
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Thursday, January 2nd, 2020 AT 8:55 PM (Merged)

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