Questions tagged [p0420]

An OBD11 fault code for Catalyst System Low Efficiency

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282 views

Nagging P0430 (and now a pending P0420 too!) 2004 Lexus ES330

I've got a 2004 ES330 (2nd owner) with roughly 315,000. We didn't pay much for the car in 2012 with 164,000 miles. So, i've never gone overboard in maintenance of it. A year ago, when it was time for ...
3
votes
0answers
1k views

P0420 Catalyst efficiency below threshold bank 1 With CO emission only!

I saw this code in OBD2 scanner on Skoda Fabia 1.2 2006 64hk petrol. It doesn't matter to me except that the car failed the inspection and I'm not allowed to drive it any more. The problem was too ...
3
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0answers
7k views

'05 Altima cranks, but will not start (sometimes)

Lately my 2005 Nissan Altima (3.5L) has been reluctant to start, having a 3-5 second delay from the time I turn the key and the starter begins working to the time the engine starts. Earlier today ...
2
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2k views

Affect of burning oil on O2 Sensors

I got a P0420 code and took my car to have a service and an investigate. I was told my car failed an emissions test and that is likely because the O2 sensors have failed causing a rich mix and higher ...
1
vote
0answers
61 views

Where are the O2 Sensors in a VW with 3 sensors?

My VW CC 2010 2.0L Sport CBFA has three oxygen sensors and two catalytic converters. The CCTA version has 2 oxygen sensors and one catalytic converter. Since the engine is in a transverse 4 ...
1
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0answers
155 views

Would a hole in the catalytic converter cause code p0420?

VW CC 2010. Catalytic converter was replaced when I first got the car at 78k miles. It is now at 83k miles. Downstream oxygen sensor was replaced at 80k miles. There is a small leak in the catalytic ...
0
votes
0answers
35 views

2013 Hyundai Accent Can't Clear 420 Code

2013 Hyundai Accent 255K miles. Runs great, still gets around 35 MPG. 40K miles ago I was having trouble with 420 code. Did usual tune up stuff and both O2 sensors. Ended up replacing the Cat with ...
0
votes
1answer
54 views

Check engine light, p0420 error and o2 sensor voltages

Good Evening, Some time ago I bought a used KIA ceed 2009. I've checked it with a mechanic who found it clean. The car was stationary for a long time and with little gasoline in the tank. I changed ...
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53 views

Can I use a CCTA catalytic converter on a CBFA engine if I live in Georgia?

VW CC 2010 2.0L Turbo (Sport) CBFA SULEV My car is a special variant of the normal VW CCs where instead of the CCTA engine I have the CBFA engine which basically means it has 2 catalytic converters ...