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Hi, I have a 2007 Lexus GS 450h, European version, and i have P0430 and P0430 error.
If i delete erros with Techstream the error come back in three or four days.....
I have to dispose of an elevator to look for leak, no? Or do you mean leak in the exhaust manifold?
2,000 km ago I have changed the catalysts. I have put aftermarket catalysts. They are the ones that I attached in the photo and they come with the exhaust manifold included.
2,000 km later the fault has returned. Diagnosis p0420 and p0430.
If I have already changed the catalysts, what else can I do?
I had this, just after the second lambda sensors, you'll find leaks in the exhaust under the thin sheet metal Cover. Seal them, then the error should go away.
I had this, just after the second lambda sensors, you'll find leaks in the exhaust under the thin sheet metal Cover. Seal them, then the error should go away.
Thank you very much for your answer. Please, in the drawing attached, where would the leaks be located?
Thank you very much for your answer. Please, in the drawing attached, where would the leaks be located?
See where the U part attaches to the downpipes, after that you have o2 sensors after that exhaust clamp and another one closer to the catalytic those are common areas for leaks.
I would take the car to a muffler shop, have them put the car on a lift. With the engine running have 2 people cover the tail pipe tips, forcing the exhaust to seep out of any leaks. At this point you should hear the whistle of the exhaust leaks out of the small cracks.
Anything under a heat shield is prone to leaking - I removed mine, there weren't leaks but let's say that it was quite eroded. Can also be the gaskets between the manifolds and the mid-section... and a lot of other things. I'd check the system, a smoke machine test is probably the best way.
I'd keep the original exhausts around if you haven't thrown them out, aftermarket cats are very hit and miss...
If you car has an exhaust leak you will be able to hear it quite easily. It could also be a vacuum leak.
Faulty oxygen sensor
Faulty air-fuel sensor
Engine misfire (could be caused by a leaking fuel injector)
Does the car otherwise start up and drive fine? Do you notice any misfire or hesitation at low RPM or high RPM?
Have you noticed the smell of gasoline when you start up the engine in the morning? Does the engine run rough or anything like that?
If you car has an exhaust leak you will be able to hear it quite easily. It could also be a vacuum leak.
Faulty oxygen sensor
Faulty air-fuel sensor
Engine misfire (could be caused by a leaking fuel injector)
Does the car otherwise start up and drive fine? Do you notice any misfire or hesitation at low RPM or high RPM?
Have you noticed the smell of gasoline when you start up the engine in the morning? Does the engine run rough or anything like that?
The car start up fine and not smell of gasoline when I start up the engine in the morning. Maybe poor acceleration (I think this car should be faster), Sometimes there is too much lag from the floor of the accelerator until the car accelerates and sometimes I notice small hesitation circulating on the highway at constant speed...
Spark plugs could cause this?
Above I have attached a pdf with the monitored diagnostic data when the error occurred. Please could you take a look to see if there is anything that reveals the cause of the problem?
The way the car behaves has more to do with the state and limits of the hybrid system. EU versions have a 3.266 rear diff instead of a 3.769, so forget about the "5.1 0-60mph" times (which are in reality 5.2-5.4) - what we get is 5.9 stated, ~6.4 actual, and it keeps pulling strong until vmax (~285kph on EU models, should be ~249kph on US, haven't seen any tests).
The car cruises at sub-1500RPM, so a little acceleration on the highway while it's suddenly asked to rev to 6600 is normal. If the engine is completely off, and it can be if the car's below a certain speed (60-70kph), there's even more hesitation. Flooring the car causes it to "hesitate" while it preps the powertrain (well, the engine RPM), gradually using the throttle leads to a gradual buildup of power.
If you want the best response, use the "virtual gears" to keep the engine near optimal RPMs. 6600 is only possible at high speeds - MG1 RPM limits (same reason why the car only goes to ~3k rpm during launches).
The PDF you posted is freeze frame data. We can only tell under what conditions this error has been logged, but given that the cat monitor runs only when the car's in certain modes... this is pretty much useless.
Check your exhaust for leaks, as people here have mentioned several times already. Smoke machine, blocking the exhaust outlets with the engine running and listening for noises, visual inspection, etc. This is the top reason on these cars - midpipe pinhole leaks, burnt gaskets, leaks behind the flanges... you name it.
...since you have wideband O2s in the front, there won't be an oscillation for the fronts, but the "oxygen storage test" is what the ECU is actually doing to measure the performance of the cat. Should be fairly obvious why an exhaust leak anywhere near the primary cats (the secondary cats are not measured) or the rear O2s can cause such errors
Read up on aftermarket cats causing repeat cat codes - usually a distinct lack of material.
2007 GS 450h P0430 and P0420 ERROR. Please Help.
