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Old 04-24-2012, 14:15   #1 (permalink)
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Code 0420 and new throttle body

I just bought a 2000 ford focus with 112k miles on it. At first it was giving off a code saying the Throttle Positioning Sensor was bad, so I had it replaced at a Ford dealer. I was told that the original part is no longer available so they used a replacement throttle body. After that the problem came back, so we took it back, and they said there had been a wiring issue and they fixed it. Problem came back for a third time in less than a week, we took it back, and they fixed a pin that was loose. Today the CEL came back on, but the car was not shifting hard as it had been before, so I took it to AutoZone to see if it was the same code. They said it was a code 0420 - catalyst efficiency low bank 1, and that I need a new catalytic converter. I was wondering if the new throttle body could be causing the code? It's a little coincidental to me that my catalytic converter went bad immediately after changing the throttle body and the car is having no other issues.

Any info would be appreciated. :)
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Old 04-24-2012, 15:15   #2 (permalink)
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Re: Code 0420 and new throttle body

Hard to say what caused it. I'd go back to the dealer that did all of the rest and see waht they have to say.
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Old 05-01-2012, 14:22   #3 (permalink)
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Re: Code 0420 and new throttle body

Sometimes a PO420 can be set because of a bad downstream 02 sensor relaying the wrong information to the ECU.
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Old 12-05-2013, 13:05   #4 (permalink)
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Re: Code 0420 and new throttle body

I've had that EVERY time I've had a bad o2, but here's some more information P0420 DTC Code - Catalyst System Efficiency Below Threshold (Bank 1)

Are there any other codes? Some times those show up after a few more miles from the first one.
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Old 12-05-2013, 14:20   #5 (permalink)
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Re: Code 0420 and new throttle body

Going by the date of post , you're unlikely to get a reply .
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