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2003 toyota fuel sensor problems, the check light is on

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6ya6ya
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Posted on Jan 02, 2017

TLFederline4
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SOURCE: resetting check engine light for 2003 Toyota Sienna

Take it to Auto Zone. They will check the codes for free, and clear them too.

Posted on Apr 04, 2009

  • 2187 Answers

SOURCE: toyota tacoma 2003 check engine light is

If the car still runs then the problem is not major but may develop into one if unchecked. The sensors in the engine may have detected problems and should be stored in its ECU. If you have a scanner have it connected to the diagnostics it should give you a clue on what to check out.

Posted on Jul 08, 2009

c17hydro
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SOURCE: Where is the MAF sensor on a 2003 4 cylinder

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Let me know if this diagram is too small

Posted on Oct 09, 2009

Pointnino
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SOURCE: check engine light on 2003 toyota tacoma, O2 sensor?

An O2 sensor code is a tricky one. It could mean SEVERAL different things, and I know how bad it sucks to hear this, but your best bet is to take it in and have a diagnostic ran on it at either a dealer or a good mechanic shop with a computer they can hook up to it. I had an "O2" code come up a while back on another car I used to have, and literally spent weeks and hundreds of dollars trying to fix it, and never did. Finally out of desperation took it in, paid the $90, and they found the problem and fixed it in like 30 minutes. Something I would have never even thought of was causing it (can't remember off the top of my head). After that I stopped wating time and money on check engine lights. One comes on in my car, I take it to have it ran for free at and auto parts store just to make sure it's not a loose gas cap or something, just to get an idea of what I'm looking at, then go and make an appointment to have to hooked up to a diagnostic computer to track down the problem. Good luck, and hope this helps save you some time and money.

Posted on Apr 05, 2010

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2003 Lexus GS300 P0031 code


Yes the O2 sensor preheater problem will turn on the VSC light, see the complaint often, why? don't know
.P0031 TOYOTA - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1
In most cases the O2 being replaced cures the code but here is the full story.
Possible causes- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit open shorted to ground
- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection
- Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit
- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit fuse
- Faulty Engine Control Module (ECM)

Jun 16, 2012 | 2003 Lexus Gs 300

2 Answers

Engine light code p171 comes up. I recently changed the air flow sensor. Everything else is working fine. What can this be in a Toyota Corolla 2003?


DTC P0171 is set when fuel trim is driven rich beyond a certain value. Possible causes are:
1. Exhaust system leak.
2. Improper fuel pressure.
3. Fuel injector restricted.
4. Defective heated oxygen sensor No. 1.
5. Defective Manifold Absolute Pressure (MAP) sensor.
6. Defective Engine Coolant Temperature (ECT) sensor.

System Too Lean. This code will set when an air fuel ratio sensor (O2 sensor) gets lazy.

Also, check for a vacuum leak on that side.



Jan 26, 2011 | 2003 Toyota Corolla

1 Answer

The engine check' light is on my sienna 2003 toyota


CAn be related to failure of many of the inputs sensors that manages the ECM. So start with the oil pressure, crank sensor, fuel pressure . replace oil /oil filter if the pressure is low.

Sep 14, 2010 | 1999 Toyota Camry

2 Answers

I have a toyota rav4 2003 management light came on checked code p1155 oxygen sensor bank1 sensor 2 changed it, cleared code light still,came on again ,changed the other three ,cleared the code again, ran...


The upper sensors are air fuel sensors and the lower ones are o2 sensors. you cant mix these up. Assuming you did everything right and still coding then either the new sensor b1s2 is bad or the wirng(power and ground need to be checked. A scan tool can be used to look at the performance of the sensors too. Sometimes the codes just point to the area of the problem and changing the part isn't the answer.

Nov 15, 2009 | 2002 Toyota Avalon

1 Answer

My 2003 Toyota Sequoia's "Trac off" light, "VSC Trac" light and "Check engine" light all came on at the same time as I was driving down the freeway at normal speed. What are these sensors really saying...


you to have your system scanned by someone. when the check engine light comes on it puts your car in safe mode it disables vechile speed control and traction as i precaution. if its running ok car is safe to drive. but u need to scan system get the code and repair whatever set the code.. most common is a air fuel or oxygen sensor problem...

Oct 10, 2009 | 2003 Toyota Sequoia

1 Answer

I have a 2003 Toyota corolla


Have you checked the fuel pumps

May 20, 2009 | 2003 Toyota Corolla

1 Answer

I have problem with code 1126 (toyota 4 runner 2001


Manufacturer Specific Codes

P1100
BARO Sensor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1120 Accelerator Pedal Position Sensor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1121 Accelerator Pedal Position Sensor Range/Performance Problem

P1125 Throttle Control Motor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1126 Magnetic Clutch Circuit

P1127 ETCS Actuator Power Source Circuit

P1128 Throttle Control Motor Lock

P1129 Electric Throttle Control System

P1130 Air/Fuel Sensor Circuit Range/Performance (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code - More Related Information

P1133 Air/Fuel Sensor Circuit Response (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code

P1135 Air/Fuel Sensor Heater Circuit Response (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code - More Related Information

P1150 Air/Fuel Sensor Circuit Range/Performance (Bank 1 Sensor 2)

P1153 Air/Fuel Sensor Circuit Response (Bank 1 Sensor 2) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code

P1155 Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2)

P1200 Fuel Pump Relay Circuit

P1300 Igniter Circuit Malfunction - No. 1

P1305 Igniter Circuit Malfunction - No. 2

P1335 No Crankshaft Position Sensor Signal - Engine Running

P1349 VVT System

P1400 Sub-Throttle Position Sensor

P1401 Sub-Throttle Position Sensor Range/Performance Problem

P1405 Turbo Pressure Sensor Circuit

P1406 Turbo Pressure Sensor Range/Performance Problem

P1410 EGR Valve Position Sensor Circuit Malfunction - Read Our Article on EGR Valve Codes For Help With This Toyota Check Engine Light Code

P1411 EGR Valve Position Sensor Circuit Range/Performance - Read Our Article on EGR Valve Codes For Help With This Toyota Check Engine Light Code

P1500 Starter Signal Circuit

P1510 Boost Pressure Control Circuit

P1511 Boost Pressure Low

P1512 Boost Pressure High

P1520 Stop Lamp Switch Signal Malfunction

P1565 Cruise Control Main Switch Circuit

P1600 ECM BATT Malfunction

P1605 Knock Control CPU

P1630 Traction Control System

P1633 ECM

P1652 Idle Air Control Valve Control Circuit

P1656 OCV Circuit

P1658 Wastegate Valve Control Circuit

P1661 EGR Circuit

P1662 EGR Bypass Valve Control Circuit

P1700 Vehicle Speed Sensor '2' Circuit Fault

P1705 Direct Clutch Speed Circuit Fault

P1765 Linear Shift Solenoid Circuit Fault

P1780 Park/Neutral Position Switch Malfunction (Only For A/T)

Back To Top Of Toyota Check Engine Light Codes Page

Mar 21, 2009 | 2002 Toyota 4Runner

1 Answer

2003 toyota camry


P0420 is a cat code. Sometimes, you can replace the upstream & downstream air/fuel & O2 sensors, run some good fuel injection cleaner thru it, and that might fix the problem. If not, you may need to replace the cat. Note that the cat is covered under warranty for 8 yrs/80,000 miles. Toyota will replace it if it has gone bad, for free.

Aug 30, 2008 | 2003 Toyota Camry

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