IS - 1st Gen (2001-2005) Discussion about the IS models up to the 2005 model

p0420 & p0420p Codes on 03 Sportcross

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Old 05-12-17, 03:25 PM
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Rowdy51
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Talking p0420 & p0420p Codes on 03 Sportcross

Guys I'm looking for a little help here. I've dug through some previous threads on this CEL and I haven't been able to find anything similar to the symptoms. I'm really looking for some guidance.

-CEL on for P0420 and P0420 P. Cat inefficiency.
-Car has strong sulfur smell after some spirited driving and high RPM.
-Traction control light is also flashing, not sure what that has to do with the CEL.

From what I've read, I cant really point my finger at the exact failure and I'm hoping that someone here has had a similar problem and knows what the issue is. With my general knowledge, the sulfur smell should point the finger at a fuel pressure regulator. Correct me if I'm wrong. Thanks in advance for any and all input!
Old 05-13-17, 01:27 PM
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01MSMSXE10
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Originally Posted by Rowdy51
Guys I'm looking for a little help here. I've dug through some previous threads on this CEL and I haven't been able to find anything similar to the symptoms. I'm really looking for some guidance.

-CEL on for P0420 and P0420 P. Cat inefficiency.
-Car has strong sulfur smell after some spirited driving and high RPM.
-Traction control light is also flashing, not sure what that has to do with the CEL.

From what I've read, I cant really point my finger at the exact failure and I'm hoping that someone here has had a similar problem and knows what the issue is. With my general knowledge, the sulfur smell should point the finger at a fuel pressure regulator. Correct me if I'm wrong. Thanks in advance for any and all input!

mine had same issue. Cats are bad.
Old 05-26-17, 11:27 PM
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Chris4.3
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I recently had the P0420 code also. I reset it and it hasn't come back yet. Took it to smog and passed.
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