Exception in rendering!

Message: window is not defined

ReferenceError: window is not defined
    at new c (/tmp/execjs20161208-85577-1rjvgjdjs:136:3912)
    at m.mountComponent (/tmp/execjs20161208-85577-1rjvgjdjs:47:15602)
    at /tmp/execjs20161208-85577-1rjvgjdjs:49:31860
    at a.r.perform (/tmp/execjs20161208-85577-1rjvgjdjs:47:12503)
    at Object.a [as renderToString] (/tmp/execjs20161208-85577-1rjvgjdjs:49:31821)
    at r (/tmp/execjs20161208-85577-1rjvgjdjs:50:21164)
    at Object.S.ReactOnRails.serverRenderReactComponent (/tmp/execjs20161208-85577-1rjvgjdjs:32:6073)
    at eval (eval at <anonymous> (/tmp/execjs20161208-85577-1rjvgjdjs:173:8), <anonymous>:10:23)
    at eval (eval at <anonymous> (/tmp/execjs20161208-85577-1rjvgjdjs:173:8), <anonymous>:17:3)
    at /tmp/execjs20161208-85577-1rjvgjdjs:173:8

Q: P0420 code comes back repeatedly, emissions readiness issue. Takes about a week for Check Engine Light to come back on.

asked by on

Repeat code P0420 for Catalyric inefficiency bank 1. However Catalytic and 02 systems show readiness on scanner, Secondary Air system shows not ready.

I have checked for vaccum leaks and fixed a couple. Replace coolant temp sensor and flange becuause of a minor leak. Replaced all spark plugs because of a bad coil. Changed the o2 sensors with OEM Bosch parts.

Also previous owner thought the air pump was bad and replaced it earlier this year.

When I changed the o2s I inspected the Cat. Looks good externally and doesn't make the rattle noise when you shake/hit it.

I have experience working on VW/Audi but this code just keeps on coming back.

I don't want to guess and just change the catalytic if it is not actually bad, but this would be my next diagnostic.

Thanks!

My car has 130000 miles.
My car has a manual transmission.

A: If this is the only code that keeps coming ...

If this is the only code that keeps coming up, and the data stream on the oxygen sensors are reacting correctly, the only real other thing left would be the convertor. If there was a wiring issue, or a sensor not responding correctly, you should be able to pick that up with the numbers on the scanner.

According to AllDataPro, the suspect would be the convertor due to the fact that P0420 is coming up by itself. If there were additional codes for the oxygen sensors, then there would be other places to look. If you still have doubts about the function of the convertor, you could always perform an exhaust gas diagnosis.

To avoid any unnecessary repairs, have one of our mobile technicians come to your home to perform these checks and properly diagnose the trouble code firsthand.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Check Engine Light on - P2187 and P0420 codes

Hello. If I understand correctly, when you say "catless downpipe," you mean that you have installed a pipe without a catalytic converter. If that is the case, you are always going to have the code for catalyst efficiency. The...

Q: Truck overheats with new thermostat and waterpump

Hi, thanks for writing in. By reading your description of the overheating issues, I'd tend to agree that the radiator fan clutch may be the culprit of your overheating issues. However, one thing to check into is whether there might...

Q: Transmission only has 1st gear

Hello. P0732 is the trouble code for an abnormal gear 2 shift ratio. If the vehicle's transmission computer detects that there is an issue with the gear ratio and timing of second gear, it will set off this code to...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...