0 like 0 dislike
243 views
by
getting a p0420 code fault engine service light comes on and then goes off.
Vehicle: 2006 Nissian Altima 2.5l 4 cyl.

1 Answer

0 like 0 dislike
by (13.5k points)
Hi there,

Typically the catalytic converter is the problem with these. You can lower the exhaust pipe and look up into the converter to see if it's broken or if it's melted. If it looks good, then it is possible the rear O2 sensor is failing and causing the code.

Related questions

0 like 0 dislike
1 answer 237 views
1 like 0 dislike
1 answer 5.8k views
0 like 0 dislike
1 answer 354 views
1 like 0 dislike
2 answers 597 views

36.2k questions

32.2k answers

1.3k comments

22.8k users

Need A Repair Shop?
Find local automotive repair shops in your area.
Does your car have Safety Recalls? → Check here
...