Cataclean and EGR Clog Codes

P0403 is an electrical problem in controlling the EGR valve. Check the connections made when the valve was replaced. Cleaning the insides would be beside the point for that code.

 

There's a "before swap" (read: correct ) photo showing the wire colors in this post, along with links to more about the pinout.

If you're sure you have the right wires back in the right spots, make sure they're also undamaged and making actual contact where plugged in.

 

Meant to post this last night and got distracted. I'd advise just going through the P0403 troubleshooting steps in the repair manual ... the code can indicate either open or short circuits detected according to voltages on any of EGR1, EGR2, EGR3, or EGR4, and the troubleshooting steps will have you check the relevant fuses and then proceed to check other things in a useful order, and it would be hard for me to say anything shorter that would be useful.

The P0441 and P0455 are evap system codes. They won't be related to the P0403, you'll just have your chance later to track those down too.

 

Use another bottle of cataclean.

I did not see you mention P0420 before and now after you used cataclean you have the code, that means it is working its way out.

I can vouch for cataclean, I used it once to see if it would help with my P0420 code.

Exactly 30 days later, the code went away but later came back on and then off and on.

So its expensive but it works, my OEM cat was already damaged and I knew it but this actually helped.

Get another bottle...

 

I love reading stories of miracle cures in a bottle.

Cataclean's a blast from the past...The British Advertising Standards Authority (ASA) looked into their claims back in 2008 or 2009 and found:

The ASA considered that the claims of Cataclean were misleading.

3. Upheld
The expert considered that using a vehicle with a known and apparently unquantified problem was bad practice. The results showed that Cataclean had no beneficial effect on emissions. The expert noted the evidence did not repeat the decreases in emissions that were demonstrated in the infomercial. We considered that the claims were misleading.

5. Upheld
The expert advised that catalyst efficiency was established by analysing the exhaust gases entering and exiting the catalyst. He noted the submitted tests did not use that method. The expert advised that the product was extremely unlikely to survive the combustion process and reach the exhaust catalyst. We considered that the claim was misleading.

Action
We concluded that the infomercial breached rules 5.1 (Misleading advertising), 5.2.1 (Evidence), 5.4.4 (Testimonials) and 5.2.6 (Environmental claims) of the CAP (Broadcast) TV Advertising Standards Code and it must not be advertised again without adequate substantiation for each claim it made.​

Code:

https://www.honestjohn.co.uk/forum/post/index.htm?t=40874#m832432

Instead, fill your tank with good quality gas and drive the a** off the car on the highway for 20-30 miles

 

Those temperature numbers are engineering guesstimates based on A/F and O2 sensor heater current.

You have the ThinkDiag. Do the "A/F rich-lean %" test under actuator tests. This will mimic the ECM's OSC cat test. (I haven't done this specifically on the ThinkDiag but it should work).

Drive the car to get the engine and cat hot. Force the engine to stay running. On my Gen2 I set the parking brake, blip the gas to start the ICE and shift to neutral before it shuts off. (Don't leave it too long because the HV system won't charge).

On the scantool start the test- then you want to select only the data for the A/F and O2 voltages. (record the following data however you can)
Switch to +25% and let it run for 10-15 seconds. A/F should be near 2.0V and O2 near 1.0V. Switch to -12%. A/F should go to almost 4.0V immediately. The wait before the O2 drops to near 0V is a measure of the cat's OSC. A very good cat takes 9 seconds or more. I usually see P0420 at 2-3 seconds or less.

Posted via the PriusChat mobile app.

 

You can upload the video clip to:

Code:

https://imgur.com/upload

Once it's uploaded, get the sharing link and post it in a comment here. It should be recognized automatically