Q: Check Engine Light on 2005 Honda Odyssey Touring Van.

asked by on October 18, 2016

I have a 2005 Odyssey Touring Van. I used Techron fuel injector cleaner to help clean the engine. Later that same evening, my check engine light came on. I went to Valvoline to check the codes, and I was advised that it was a misfire code for all 6 cylinders. I then went to Firestone, and I was told that both of my catalytic converters and my O2 sensor needed to be replaced. Firestone had also just replaced my serpentine belt and starter over the previous 2 weeks. They could not tell me exactly which one needs to be replaced, just that all of it needed to be replaced. I advised no, then went home. Next morning, the check engine light was gone. There was no issue until 3 days later, when I filled up the tank with a higher grade gasoline. Later that day, the check engine light comes back on. Could the Techron and higher grade gasoline be causing the buildup in the engine to breakup and cause the light to come on?

Hello, thanks for writing in. You do not need to use high grade of gasoline. The problems you are having may be due to the adding of the Techron which is causing any water in the fuel to disperse and be burned by the engine. This can cause erratic misfires and the Check Engine Light to come on.

The Techron itself should not be a problem, the possibility of water in the fuel tank is the real issue. Run the fuel you have in the tank out until you have less than 1/4 of a tank left then fill it up with regular fuel. See how the engine runs and if the Check Engine Light clears. Then drive the car to see if it comes back on. Do not do any work on the car until you do what I stated to do.

If the problem persists, have the Check Engine Light diagnosed by a certified technician, like one from YourMechanic, who can come service your car at the convenience of your own home.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Do I need alignment after replacing front shocks and struts

Some vehicles have fixed front camber which is typically the only alignment criteria (measure) that would be affected by strut replacement. However, your vehicle does have adjustable camber settings and so, yes, the vehicle would have to be aligned if...

Automatic transmission

Hello. This is a very robust transmission, as your advanced mileage demonstrates! The downshift issue you have described is likely either the governor (possibly a broken spring?), internal to the transmission, or an issue related to the throttle position sensor,...

Noise above 40 mph

Try to rotate the tires to see if the noise changes on your 2004 Ford E-350 Econoline. I have had many noises caused by uneven tire wear, alignment issues, or lack of tire rotations. You already replaced all the other...

Related articles

P003A OBD-II Trouble Code: Turbocharger/Supercharger Boost Control "A" Position Exceeded Learning Limit
The P003A trouble code means the Electronic Computer Module (ECM) has detected an issue in the turbocharger or supercharger system.
P2620 OBD-II Trouble Code: Throttle Position Output Circuit Open
P2620 P2620 code definition Throttle Position Output Circuit Open What the P2620 code means P2620 is an OBD-II code for the engine control module (ECM) detecting the throttle position closed output circuit is open and cannot detect a closed throttle....
P002A OBD-II Trouble Code: "B" Camshaft Profile Control Circuit/Open
Diagnostic Diagnostic Trouble Code (DTC): P002A What the P002A code means Engines operate by way of a system of moving parts that open the intake valves (for allowing gas into the cylinders) and exhaust valves (which carry the vapors away)....