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Obd1 codes Code pd421. On. Diesel

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Is there a knock senser on a 1994 Mazda b3000. The code flashes 331

The engine in your B3000 may not be the original; I find no listing for that code, only these:

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Look down the page for the only codes I found listed and they are all OBD1 prior to 1995.

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How to test the obd codes

What is year--make--model? Generally 94 model year and older is obd1. 96 and newer is obd2, generally. 95 can be a cross-over year and could have a hybrid diagnostic connector.

Usually with obd2, you need an obd2 code reader. OBD1 you should be able to access some codes, yourself, w/o a code reader. Different makes can have different procedures for accessing codes/obd1.

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Yes OBD1 can be read without a reader. The CEL will blink to indicate the code to you. Do a google search to find the code.

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Check and clean the egr valve and passages beneath it.
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A 1995 model Buick should be OBD2 which would require a scanner or code reader. If it is an OBD1 system you can jumper two terminals on the test plug to make the warning light flash.

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How do i get the Trouble codes on my 94 loyale wagon engine light is on and it won't start

Hi Pegrim, I believe on that vehicle year, the system is probably OBD1 You would do better to have a diagnostic check carried out on the computer. If you need the pin outs let us know the make model and year of manufacture of the vehicle and if it is petrol or diesel? In fact as much info as you can manage. Regards John

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95 park avenue, how do I read the obd1 codes thru the car

you have a obd2 it has 16 data link connector you have to use scanner to get the obd1 system have 12 data link connectors..the top two at far right is where you put jumper wire to retrieve code.

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