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5

If you have rattling on acceleration and the fuel economy is depressed, it is very likely that the catalytic converter core has cracked and it is blocking the exhaust now. You can try to measure its efficiency first by looking if the rear O2 sensor voltage reading after heating is steady (so the catalytic converter is good) or jumping (so it is bad). If it ...


4

The P0420 and P0440 are completely unrelated (other than both being related to emissions). The P0420 is having to do with catalyst function. The P0440 having to do with EVAP system. There is no way for one code to have morphed into the other code. P0420 can appear and disappear over time due to the nature of what is being seen by the computer. If the after ...


3

It definitely sounds like you have a serious issue with the catalytic converter and should have it replaced. Replacement with a universal converter should not be expensive. In expensive Silicon Valley (and air conscious CA) I got a replacement for $220 at a specialist shop. However, the failure of your catalyst is a symptom of another issue and not a cause, ...


2

Essentially the technical meaning of a p0420 is that the downstream o2 sensor is detecting an inconsistency with fuel trim. Generally this is code is associated with a bad catalytic converter. Many things can cause this code, but usually the easiest ways to figure it out are testing it with a hydrocarbon analyzer. The dealership usually has one of these. If ...


2

There are a lot of things that can set this code, so it can be time consuming to figure out, and there are some special tools that make the job a lot easier. You can do it without the special tools, it's just going to take longer. The list below is what it takes to set the code. When VSV for pressure switching valve is ON, ECM judges that there is no ...



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