Question about 2005 Subaru Outback
My check engine light came on on my 2005 Subaru Outback and the dealership ran a diagnostic on it and said the diagnostic code was P0420. They said it would cost @ $1,200.00 to make the repair. This seem like an awful lot. What is this diagnostic code and do you think the repair amount is within normal bounds?
Hi, this code represents a Catalyst System Efficiency Below Threshold
(Bank 1). and the repair, considering that it will be repaired by the dealership, seems to be in the normal cost range. The labor is what usually inflates the price when dealing with catalytic replacements.
You could probably get a better deal by taking it to a non dealership type of repair shop. This may cut at least 200 dollars of the original dealership quote.
Please rate and god bless:)
Posted on Apr 14, 2009
Maybe it is just the front O2 sensor which is a $170 part. This below taken from the repair manual: I am thinking that the Subaru dealer wants to replace everything just to CYA. I know on mine it was the O2 sensor.
AU:DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK
1. OUTLINE OF DIAGNOSIS
Detect the deterioration of catalyst function.
Though the front oxygen sensor output would change slowly with a new catalyst, the sensor output with a deteriorated
catalyst becomes high and the inversion time is shortened. For this reason, the catalyst diagnosis
is carried out by monitoring the front oxygen sensor output and comparing it with the front A/F sensor output.
Posted on May 03, 2009
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Posted on Jan 02, 2017
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code PO420 you have is Catalyst System efficiency is below threshold bank one.
Usually replacing the O2 sensor that's the front most in the exhaust system
will cure your problem,
Your Check Engine light
is on and you find a P0420 code for a catalytic converter fault. Does that really
mean your converter has reached the end of the road and needs to be replaced? A
new converter can cost $600 to $1000 or more if a new car dealer or repair shop does the
job, or maybe half that amount if you do it yourself. It's an expensive fix
that may or may not be necessary. The problem, in most cases, is an emissions
issue, not a performance issue that affects the way the engine runs.
A P0420 diagnostic
trouble code is a "generic" fault code that is set when the Onboard Diagnostic II
(OBD II) system sees a drop in converter efficiency. The
OBD II system monitors catalyst efficiency by comparing the switching activity
of the upstream and downstream oxygen sensors in the exhaust. The upstream O2
sensor in theexhaust manifold reflects the
condition of the exhaust gases as they exit the engine. The downstream O2
sensor in or behind the catalytic converter reflects the condition of the
exhaust after it passes through he converter.
The catalytic converter
is like an after-burner. It oxidizes (burns) any residual fuel vapors (unburned
hydrocarbons or HC) in the exhaust. It also burns any carbon monoxide (CO) in
the exhaust. The exhaust must meet federal emission standards, and if a problem
exists that causes emissions to exceed the federal limits by 150%, the OBD II
system is supposed to catch the fault, set a code and turn on the Check Engine
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