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Post by flyboyprowler on Nov 17, 2020 9:22:56 GMT
Our 2003 RAV petrol auto failed the Spanish MOT this year on emissions. The spark plugs were changed and it just scraped through the retest. The "eng" light is on and the fault codes are 420 and 430, the catalyst efficiency below threshold on banks one and two! The car runs perfectly but needs to be fixed. Sooooo, will I need to change the sensors, (I changed them quite a few years ago with Denso OEM) or is there a known problem with the CAT manifold that may need a manifold change? Any thoughts or experiences welcome!
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Post by charliefarlie on Nov 17, 2020 11:04:42 GMT
Our 2003 RAV petrol auto failed the Spanish MOT this year on emissions. The spark plugs were changed and it just scraped through the retest. The "eng" light is on and the fault codes are 420 and 430, the catalyst efficiency below threshold on banks one and two! The car runs perfectly but needs to be fixed. Sooooo, will I need to change the sensors, (I changed them quite a few years ago with Denso OEM) or is there a known problem with the CAT manifold that may need a manifold change? Any thoughts or experiences welcome! Try the battery disconnect first to see if that clears the light. 👍👍 |
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Post by unclebob on Nov 17, 2020 11:23:19 GMT
Our 2003 RAV petrol auto failed the Spanish MOT this year on emissions. The spark plugs were changed and it just scraped through the retest. The "eng" light is on and the fault codes are 420 and 430, the catalyst efficiency below threshold on banks one and two! The car runs perfectly but needs to be fixed. Sooooo, will I need to change the sensors, (I changed them quite a few years ago with Denso OEM) or is there a known problem with the CAT manifold that may need a manifold change? Any thoughts or experiences welcome! The cheaper fix would be to replace the oxygen sensors again...... Expensive fix Would be new exhaust catalyst converter 🙁 little read here ..... www.fixdapp.com/blog/p0420-code |
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Post by Ravasher on Nov 18, 2020 7:32:42 GMT
We had the sensors fail on ours too. I can’t remember the exact code but it was one of the O2 sensors. Had it replaced and it’s been fine since.
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Post by flyboyprowler on Nov 18, 2020 8:48:35 GMT
We had the sensors fail on ours too. I can’t remember the exact code but it was one of the O2 sensors. Had it replaced and it’s been fine since. My codes say that they all need to be replaced so I will definitely go down that route. I seem to remember that the 2003 cars had a problem with the manifold shape that caused the light to come on, but I don't know the solution. The codes can be erased, and our local mechanic did something that kept the light off for a longer time. But do the sensors actually effect the emissions at the exhaust pipe end, or is that another issue? Thanks to Charlie and Bob too, and that reference Bob, was interesting.  |
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Post by Ravasher on Nov 18, 2020 8:58:33 GMT
We had the sensors fail on ours too. I can’t remember the exact code but it was one of the O2 sensors. Had it replaced and it’s been fine since. My codes say that they all need to be replaced so I will definitely go down that route. I seem to remember that the 2003 cars had a problem with the manifold shape that caused the light to come on, but I don't know the solution. The codes can be erased, and our local mechanic did something that kept the light off for a longer time. But do the sensors actually effect the emissions at the exhaust pipe end, or is that another issue? Thanks to Charlie and Bob too, and that reference Bob, was interesting. IIRC we had 2 replaced. After the 1st was replaced the light came back on again and the 2nd one was replaced. I’m going back about 3 years now I think roughly and it’s been fine since. Not sure about manifold and I wouldn’t have any idea about that. Ours is a 2005 model. The only complaint I would have about the car is being an auto it’s a little thirsty but overall it’s a fab car and apart from wear and tear (and the front wheel arch extension kissing the gate post 😩 regularly) it’s never let us down. |
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Post by shcm on Nov 18, 2020 9:46:20 GMT
But do the sensors actually effect the emissions at the exhaust pipe end, or is that another issue? Yes, that's why they are there. It's a closed loop feedback system. Basically the engine ECU uses the lambda (oxygen) sensor output (and other things) to continually adjust/tweak the air/fuel ratio used in combustion. Lambda sensors placed before the catalytic converter figure in most of this role. The sensors after the cat, are more to do with monitoring the cat's condition/effectiveness. |
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Post by flyboyprowler on Nov 18, 2020 10:26:41 GMT
But do the sensors actually effect the emissions at the exhaust pipe end, or is that another issue? Yes, that's why they are there. It's a closed loop feedback system. Basically the engine ECU uses the lambda (oxygen) sensor output (and other things) to continually adjust/tweak the air/fuel ratio used in combustion. Lambda sensors placed before the catalytic converter figure in most of this role. The sensors after the cat, are more to do with monitoring the cat's condition/effectiveness. Ah, thanks for that. I had the ECU rebuilt a few months back after diagnostics and the car now runs really well. Fuel consumption is not great, and seems to be worse than before at around 27MPG (computer) but we do live in the hills in Spain and the consumption improves if we go down the coast! There is no tell tale eggy smell so I suppose the CAT is OK, and the mileage now is 235000 KMS approx 180000 miles. |
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