Check engine light

Tiny
VIVIANXP
  • MEMBER
  • 2010 TOYOTA RAV4
  • 4WD
  • 32,100 MILES
Check engine, 4WD, and slip indicator light all on at the same time. It has been on for at least 2 days. Last time this occurred was June 2nd and it went away the same day. I took my car to AutoZone and the scanner read "P0137 Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 PERMANENT."

I do have to travel for 4 hours in the next upcoming days and will be wondering if this is an issue I can fix when I return home by the end of next week, instead of bringing my car to a mechanic immediately and forking over what upon research, says about $200 in repairs. Thanks for your help in advance.
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Friday, July 10th, 2015 AT 9:15 PM

29 Replies

Tiny
HMAC300
  • EXPERT
Your fuel lmileage may not be the best and stuff wont' work right probably. Up t o you to drive it. If it's only a n O2 sensor it won't hurt much.
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Saturday, July 11th, 2015 AT 6:37 AM
Tiny
BUDMANKOJAK
  • MEMBER
  • 2008 TOYOTA RAV4
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 36,800 MILES
The Check engine light, VSC and 4WD lights came on all at once, on my 2008 Rav4 w/ 36,800 miles. Any thoughts on what could have caused this an what the problem my be?
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Thursday, January 2nd, 2020 AT 8:51 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
Check engine light on

http://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
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Thursday, January 2nd, 2020 AT 8:51 PM (Merged)
Tiny
ELBLANCHIE
  • MEMBER
  • 2011 TOYOTA RAV4
  • 19,000 MILES
A few days I asked about my Rav 4 and a broken rocker arm. I picked my car up after the rocker arm was replace and drove it home 30 miles, the next morning it did the same thing as far as skipping: and the check engine light and auto LSD light blinking continuously. The service dept said it was carbon build up making the rocker arms jump back off. And that wasn't covered under warranty, cost me $140.00. What do you think? Do I have a lemon? What should I do?
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Thursday, January 2nd, 2020 AT 8:51 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Carbon build-up at 19000 miles? How would you expect people to buy that? Get back to the service dept and insist they find the solution to your problem.
Something is definitely wrong with the engine and if it occurred twice, it is going to happen again and the problem to be covered under warranty.
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Thursday, January 2nd, 2020 AT 8:51 PM (Merged)
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2007 TOYOTA RAV4
  • 63,000 MILES
I had oil changed drove 200200 miles then vsc 4wd4wd check engine light came on after opening hood I found oil cap was not put on and oil spray on motor
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Thursday, January 2nd, 2020 AT 8:51 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Replace cap. Add oil and you will have to clean off the motor. A sensor most likely got wet.

What was the code.

Roy
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Thursday, January 2nd, 2020 AT 8:51 PM (Merged)
Tiny
MARTIN N. AARVåG
  • MEMBER
  • 2004 TOYOTA RAV4
  • 2.0L
  • TURBO
  • 4WD
  • MANUAL
  • 125,000 MILES
I have a problem, usually uphill but not every time. Vsc/trc lamp and the engine light lights up, and I loose all engine power. I can just turn off the engine and turn it back on to keep on driving. Then the vsc/trc lights is gone but the engine light is still on but it goes away after a few hours or the next day.
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Thursday, January 2nd, 2020 AT 8:51 PM (Merged)
Tiny
HMAC300
  • EXPERT
Scan fro codes and check fuel pressure with a gauge auto parts rent it.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Thursday, January 2nd, 2020 AT 8:51 PM (Merged)
Tiny
DISSBS
  • MEMBER
  • 2003 TOYOTA RAV4
Engine Mechanical problem
2003 Toyota Rav4 6 cyl Four Wheel Drive Automatic 48445. Miles

engine light came on. Took it in and it was put on computer. They said found code po440 po441 po446 internal failure in the charcoal canister and rec gas cap. They want 577. To repair. How do I know this is right?
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Thursday, January 2nd, 2020 AT 8:53 PM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
Those engine codes do indicate faults in these components. The estimate is also right on for these repairs. The parts is the most expensive, with the canister costing $300 alone. Add the fuel cap and 2 hours of labor at approx. $75 / hour this adds up very close to your estimate
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Thursday, January 2nd, 2020 AT 8:53 PM (Merged)
Tiny
STARWISHER115
  • MEMBER
  • 2000 TOYOTA RAV4
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 64,000 MILES
I have cleaned the MAF & replaced the air filter, disconnected the battery to reset the computer, light came back on about 10 miles later. Car is running better since the cleaning (low idle when first started, little acceleration going uphill). How do I find out if it's the sparkplugs, O2 sensor, needs new MAF, vacuum leak or something else? Seems there are a lot of possibiltiies to cause this. Any ideas?
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Thursday, January 2nd, 2020 AT 8:53 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Hi starwisher115,

When the MIL indicates, trouble code(s) would be stored in the Power Control Module. You would need to retrieve the trouble code to understand what is cauing the MIL to show.

Get a free scan done at Autozone and let me know the exact trouble code so I can assit in solving the problem.
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Thursday, January 2nd, 2020 AT 8:53 PM (Merged)
Tiny
STARWISHER115
  • MEMBER
I had the codes read & got PO171. Have also noticed turning on the A.C. Really affects the acceleration & idle.
I didn't remove the MAF when I cleaned it, Would that have made a difference?
Is there any site that would give me step by step directions on replacing the MAF myself?
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Thursday, January 2nd, 2020 AT 8:53 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Here are the description of the code and diagnostic procedures.

DTC P0171 OR P0172: SYSTEM TOO LEAN/RICH (EXCEPT CALIF. EMISSIONS)
Circuit Description
Fuel trim refers to feedback compensation value compared against basic injection time. Fuel trim
includes short-term and long -term fuel trim.
DTC P0171 is set when fuel trim is driven rich beyond a certain value. Possible causes are:
√ Air induction system malfunction.
√ Fuel injector restricted.
√ Defective Manifold Absolute Pressure (MAP) sensor.
√ Defective Engine Coolant Temperature (ECT) sensor.
√ Improper fuel pressure.
√ Exhaust system leak.
√ Heated oxygen sensor No. 1 circuit is open or shorted.
√ Defective heated oxygen sensor No. 1.
√ Defective ECM.
DTC P0172 is set when fuel trim is driven lean beyond a certain value. Possible causes are:
√ Fuel injector restricted or leaking.
√ Defective Manifold Absolute Pressure (MAP) sensor.
√ Defective Engine Coolant Temperature (ECT) sensor.
√ Ignition system malfunction.
√ Improper fuel pressure.
√ Exhaust system leak.
√ Heated oxygen sensor No. 1 circuit is open or shorted.
√ Defective heated oxygen sensor No. 1.
√ Defective ECM.

Diagnostic Aids
When DTC P0171 is recorded, actual air fuel ratio is too lean. When DTC P0172 is recorded, actual
air fuel ratio is too rich. If vehicle runs out of fuel, DTC P0171 will be set. Using scan tool, read
freeze frame data. Freeze frame records engine conditions when malfunction is detected.
Diagnosis & Repair
CAUTION: If ECM replacement is instructed in following testing, always ensure ECM connectors and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction.
NOTE: Heated oxygen sensor No. 1 refers to oxygen sensor closest to engine block. Heated oxygen sensor No. 2 refers to oxygen sensor farthest
from engine block.
1. Ensure oil dipstick, oil filler cap, PCV system and all other air induction system components are intact and operating properly. If problem exists, repair as necessary. If problem does not exist, go to next step.
2. Check fuel injectors. If problem exists, repair as necessary. If problem does not exist, go to next step.
3. Check Manifold Absolute Pressure (MAP) sensor and Engine Coolant Temperature (ECT) sensor. If problem exists, replace appropriate component. If problem does not exist, go to next step.
4. Check spark and ignition system. If problem exists, repair as necessary. If problem does not exist, go to next step.
5. Check fuel pressure. If fuel pressure is not within specification, repair as necessary. If fuel pressure is within specification, go to next step.
6. Check exhaust system for leaks. If problem exists, repair as necessary. If problem does not exist, go to next step.
7. Connect scan tool to Data Link Connector (DLC) No. 3. Start engine and increase engine speed to 2500 RPM for approximately 90 seconds. Let engine idle. Using scan tool, monitor heated oxygen sensor No. 1 output voltage. Voltage should alternate repeatedly from less than.4 volt to more than.5 volt. If voltage is as specified, go to step 9. If voltage is not as specified, go to next step.
8. Check for open or short in wiring between ECM and heated oxygen sensor No. 1. If problem exists, repair wiring as necessary. If problem does
not exist, replace heated oxygen sensor No. 1.
9. Perform test drive confirmation, then go to next step.
10. Clear and recheck for DTCs. If DTC P0171 and/or P0172 are displayed again, replace ECM. If neither DTC P0171 nor P0172 is displayed again, go to next step.
11. Vehicle either ran out of fuel or problem is intermittent. Check component and ECM connections.

MAF is plugged into air cleaner housing and can be remove after taking out the holding bolts. No tricks in a straight forward job.
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Thursday, January 2nd, 2020 AT 8:53 PM (Merged)
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2004 TOYOTA RAV4
  • 69,000 MILES
WHY DOES MY VSC TRAC WARNING AND CHECK ENGINE LIGHT STAY ON
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
An error has been detected by the engine management system and you need a scan to retrieve the trouble code, proceed with repairs to rectify the fault and erase the trouble code to have the MIL go off.
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
PAUL RODGER
  • MEMBER
  • 2003 TOYOTA RAV4
  • 2.0L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 95,000 MILES
Is it wise to buy this model as I have heard there are problems with the engine management warnings?
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
RAV4's are great cars, and normally very reliable, buying second hand is always a gamble as you often do not know the service history of the car, if you like it, ask the owner if you can get it checked over by a mechanic first, if they are honest and they feel the car is in fair condition, they should not have a problem, if they say no, well don't bother as they may be trying to hide something, all cars have check systems now, these are internal self test systems that tell you when you have a problem, the mechanic can do a scan to see what has been set in the past and if there are any current codes as not all codes will set a check light.
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2001 TOYOTA RAV4
  • 190,000 MILES
Engine light is reads p0446 would it be worth getting fix
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Thursday, January 2nd, 2020 AT 8:54 PM (Merged)

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