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• Check Engine Light Toyota Camry
• How To Turn Off Service Engine Light
• Toyota Camry Check Engine Light Blinking
• Toyota Engine Check Light On
• Camry Check Engine Light Reset

1. Toyota »
2. Corolla »
3. 2003 »

Mar 11, 2008  the check engine light suddenly came on and i'm taking a 1 hour trip tomorrow. I'm planning to take the car to the mechanic this weekend but should i be worried. Keep in mind, i know squat about cars. Check engine light on 2003 Toyota Corolla S? Turn your car off and go back inside and tell them to search for the code in their.

My truck has a little over 80,000 miles on it. I service it regularly (and always put the gas cap on straight and tight), but the check engine light comes on. I don't want to go to the dealer and have to pay for them to pay for a light that doesn't correlate to anything. Does anyone have a way to. May 13, 2011  Press the 'erase/clear' button on your scanner, then turn off the key and disconnect it. Clearing any codes present will turn off your check engine light temporarily. After pressing 'erase/clear' and waiting until you see a 'no codes' message, you can turn off your vehicle and disconnect the scanner. Aug 10, 2009  Hello, My Dad has a 2003 Camry 4 cylinder engine with only 36,660 miles on the odometer. About a week ago he filled the gas tank and when he restarted the engine the check engine light came on.:frown: I took it to AutoZone a few days later and had them scan the car for any codes it would have. Jun 19, 2017  how to fix check engine light easy reset error on TOYOTA ECHO. A colleague asked me to help diagnose errors on his Toyota Echo 2001. I connected the ELM327 s.

Check Engine Light Toyota Camry

Oct 04, 2008  I passed my inspection but failed because check engine light was on have 2003 toyota sequeia can i turn off check engine light to pass inspection without fixing what the codes say are wrong with car. Toyota Cars & Trucks. How to Turn the Check Engine Light off on a 2003 Toyota by Jeffrey Caldwell 2003 Toyotas use a system known as on-board diagnostics, or OBDII, to ensure that the emissions equipment is functioning properly.

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2003 Toyota Corolla

Typical Repair Cost:

$460

Average Mileage:

119,900 miles

Total Complaints:

3 complaints

Most Common Solutions:

1. not sure (1 reports)
2. replace the oxygen sensor (1 reports)
3. replaced O2 sensors and evap vent solonoid (1 reports)

exhaust system problem

Helpful websites

• No one has added a helpful site for this 2003 Corolla problem yet. Be the first!

2003 Toyota Corolla Owner Comments

Corolla CE 1.8L

• Automatic transmission
• 150,529 miles

I have had the car for 1 year and the only problems were the O2 sensors and the evap vent solonoid.

Update from Mar 10, 2015: I now have had the car for 2 years.I had to replace the catalytic converter at 169,000 miles. It had been replaced by the dealer before I purchased the vehicle at 133,000 miles. I looks like there is a problem with the catalytic converter on the 2003 Corollas. My mechanic did the converter job for $635.

- Don M., Parma, OH, US

Corolla CE 1.8L

• Automatic transmission
• 126,138 miles

When I was looking to buy this car, the Check Engine light was on. The previous owner said Toyota told him it was code P0420 which meant the Catalytic needed replacing. He didn't do it as the cost was over $500 and he said the car ran OK. I asked if I could get a pre-purchase inspection before I bought it.

I checked a few web sites regarding the P0420 code and came across that it isn't usually the Catalytic. I brought it to Toyota and asked the Mechanic to check exhaust emissions after the Catalytic. He did and said it seemed good. He suggested to start by replacing the Oxygen (O2) sensor after the Catalytic to see if that solved the engine light problem. Everything else was good or just needed maintenance stuff ( ..filters, etc..). So I decided to buy the car and try and fix the Engine light issue.

Toyota's cost for the O2 sensor was $285 + ~$100 install. I bought the sensor through a Mechanic friend wholesale for about $160 and took about 3 hours to install it myself (I took my time ). It needed some wd40 to loosen the old sensor from the rusted exhaust, but then it was pretty straight forward. I then reset the computer by disconnecting the battery for about a minute.

It's now been about 3 months and the light has not come back on. Anyone else who gets the P0420 code, don't rush out to replace the Catalytic. I think the computer is not specific enough to pinpoint the problem, so you need do some old fashioned trouble shooting first.

The car now runs great. Toyota makes a good engine, so don't let the engine light scare you from buying or keeping the car.

Good Luck .. Davy

- davy892, Kelowna, BC, Canada

Corolla LE 4 cyl

• Automatic transmission
• 83,000 miles

How To Turn Off Service Engine Light

My mechanic, who's judgment I trust, tells me that the reason my Check Engine light is on is that my car's catalytic converter sensor is faulty. He says the converter is operating properly.

He called Toyota regarding a fix - and their suggestion was to replace both the sensor and the computer it feeds. He tells me that will run in excess of $1,000 and recommends against doing so. Apparently, the warranty on that system ran out at 80,000 miles, so any fix is on my nickel.

I have no problem with the car as-is (although I would like the Check Engine light is effectively useless), but a buyer will doubtless be concerned about the problem. I know I would be if I were buying the car.

I'm wondering if I'm alone in experiencing this problem - and if anyone has a fix that's a tad more affordable than $1,000.

Update from Mar 7, 2010: My mechanic, who's judgment I trust, tells me that the reason my Check Engine light is on is that my car's catalytic converter sensor is faulty. He says the converter is operating properly.

He called Toyota regarding a fix - and their suggestion was to replace both the sensor and the computer it feeds. He tells me that will run in excess of $1,000 and recommends against doing so. Apparently, the warranty on that system ran out at 80,000 miles, so any fix is on my nickel.

Toyota Camry Check Engine Light Blinking

I have no problem with the car as-is (although constantly-illuminated Check Engine light is effectively useless), but a buyer will doubtless be concerned about the problem. I know I would be if I were buying the car.

I'm wondering if I'm alone in experiencing this problem - and if anyone has a fix that's a tad more affordable than $1,000.

- kytourguy, Louisville, KY, US

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Toyota Engine Check Light On

The reset check engine lights process takes an extra step on modern cars. Before the deployment of OBD II in 1996, resetting a check engine light was a simple matter.

Just disconnect the battery for more than 10 seconds and you’re done. You could even pull the electronic control module fuse on many models.

Then OBD II came along. They started rolling it out in late 1995 model year. By 1996 this diagnostic system changed the way car makers set and stored codes inside the on-board computer.

If the automobile you’re working on is newer, I Do Not Recommend disconnecting the battery. However, if you stick with me I will explain how to reset check engine lights by disconnecting the battery, even on these cars.

Yes, there’s a trick for draining the capacitor that holds power for the electronic control module’s stay alive memory. As a certified professional auto mechanic it’s my duty to let you know what kinds of problems are common when you perform this operation.

Will the Warning Light Come Back On

If the issue is intermittent, the light may stay off for a while. But we have to remember if this is a hard failure with a sensor or a car computer problem the light will come right back on.

This is why I ask you to consider pulling the codes and following the diagnosis for the specific code set. Fixing the problem could be easier than trying to avoid it.

This is how professional mechanics solve car problems. A new U480 CAN-BUS code reader is not expensive at around 19 bucks including shipping. Here’s another reason for not disconnecting the battery.

Newer vehicles have a few installed options requiring constant battery voltage. In addition you don’t want to lose the custom settings like radio stations and power seat memory after getting everything just right.

I know what you’re thinking, what if you have to replace the battery. On many luxury cars they store power to hold on to all the vital settings. If you use the method described below you defeat this piece of engineering.

In fact, I’ve had the battery out on some Cadillac models for an entire day and didn’t have to reset the clock. On older cars I use a device called a battery tender.

These inexpensive devices are sold at most auto parts stores. I have the power-built model shown on the right. You plug it into the cigar lighter or accessories socket before you disconnect the power and ground cables from the battery.

The external power source holds the radio station presets and clock settings. But more importantly it also keeps the on-board memory alive for the power-train control module (PCM). This means the car doesn’t have to relearn shift points and idle settings.

Problems with Disconnecting the Battery

For example, if you have a theft deterrent radio and you disconnect the battery, it might stop working.

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When you disconnect the power to reset the check engine light the car radio might go into a self-defense mode.In this scenario it won’t operate until you input a special code. In most cases they include the code in your owner’s manual. Sometimes the dealer supplies it at the time of delivery.

This may not do any good if you bought it off a used car lot. Also note that disconnecting the battery on cars with a factory installed alarm or active theft system can cause problems.

The owner’s manual might provide a special procedure for disabling the alarm system before disconnecting the battery.

Some car makers provide a built in sleep mode for just this operation. Last, but not least, stored in the computer along with the code you’ll find the automobiles learned memory. This stores driving habits like shift points and IAC steps for idle control.

Engine Stalling After Disconnecting the Battery

You might have stalling and hard shifting problems for a while after reconnecting the battery. It will usually recover automatically, but it can take several drive cycles for this to happen. An easier way to clear the check engine light codes is to use an auto scan tool.

These scanners have come a long way and now include better documentation. This will walk you through how to retrieve the codes and reset the check engine light.

Clearing codes without disconnecting battery power sidesteps the problems mentioned above. One of the best selling automotive scanners right now, at the time of this writing, is by Innova.

However, keep in mind competition is fierce in this market and things change quickly. The good news is this situation is driving prices down and innovation up.

If you spend a little more you get a tool you can grow into. Take a look at the customer reviews on this item before buying it. The 3040c model can read the data stream and may be overkill if you just want to reset check engine lights.

Camry Check Engine Light Reset

For people that want to keep it simple yet benefit from on screen definitions then check out the cheaper Equus 3030g below.

How to Clear Codes Without a Scanner

If you decide to disconnect the battery I have an important tip for you. Most vehicles from 1996 and newer have a keep alive memory built-in to the computer system.

Disconnecting the battery alone will not reset the check engine light. The computer will be able to hold the memory and the code for several minutes and in some cases several hours.

They supply battery voltage through a capacitor keeping the internal memory alive. The way around this is to disconnect the battery and then hold down on the horn button for at least 30 seconds. The horn circuit is one of only a few that’s hot at all times, regardless of key position.

This is why you can blow the horn without having the ignition turned on. Holding down on the horn button drains the electrical current stored in the control module. Using the horn circuit resets the check engine light and all memory related functions on most models.

Remember, when you do this you’ll be erasing all memory learned by the computer on previous drive cycles along with radio stations, clocks, seat memory and collected driver information center data like average fuel economy.

Side Effects of Disconnecting the Cars Battery

Therefore, when you reconnect the battery and confirm the reset procedure, you’ll find the engine idle erratic for several drive cycles. The transmission shifts can also feel different from the last time you drove it. This is because the shift point data collected from the transmission speed sensor is gone along with the check engine light code.

This problem is short-term and will correct itself after driving the car at highway speeds. Also note if the check engine light comes back on after this reset procedure you have a hard failure code. This is when a malfunction is constant and needs further diagnosis.

So to review you do have a few options for resetting your check engine light, but the easiest way is to use an auto scan tool. To the left is one of the cheaper Bluetooth scanners on the market. The 34t5 Bluetooth OBDII scanner for Android devices works great, but you have to get an app from the play store to make it work. I think the best one they call Torque Pro and it’s $5.

The tool communicates with all OBD II protocols from 1996-2016.Any of these methods are much better then disconnecting the car battery. Using the automotive scanner tool will avoid all the above-mentioned problems. If you’re interested in a scan tool that can do more, visit the automotive scan tool reviews page.

In the auto scan tool section find articles about diagnosing engine lights. Plus more on the reset check engine light procedure using automotive scanners. See if your issue is covered in these in-depth articles.

The next link is for the homepage. Learn more about the car mechanic that built this site and review an outline of what’s covered on Auto-Facts.org.

Professional mechanics already researched and answered a few common questions. Use these standard diagnostic procedures and techniques to gain positive results on the Diy auto repair page.