Question about 1997 Chevrolet C1500

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I keep getting code p0420. I replaced 2 cats, all 4 o2 sensors, plugs, wires, cap & rotor, cleaned air filter, sprayed maf sensor, new fuel injection spider, 2 mufflers. What is the problem?

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  • yadayada
    yadayada May 11, 2010

    P0420 is a Catalytic converter efficiency monitor code, why would you replace the O2 sensors?? the code indicated that the catalytic converter is worn out, did u do the pin point tests in the service manual?

  • yadayada
    yadayada May 11, 2010

    quit guessing and have the dealer fix this or use our live chat.

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P0420 code is usually a sign of s weak fuel pump, and needs to be replaced. Also if you replace the pump and still get that code, check your fuel lines back by the tank and make sure that they are not pinched or smashed. this will also give the same code due to restricted fuel pressure, on the ruturn or supply line........ Good Luck

Posted on Oct 08, 2010

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Put some injector cleaner in your tank might have a clog ..K44 might help

Posted on Jul 31, 2009

  • arizonatruck Mar 12, 2012

    On half a tank of gasoline you might add 1 gallon of lacyer thinner which can be found in the paint section of most hardware stores or your local Wall Mart. $15.00 plus. I also disconnect the battery for 15 minutes to reset the computer code which is what the check engine light is trying to tell you that a sensor is detecting a issue. Lawyer thinner

  • arizonatruck Mar 12, 2012

    Lacquer thinner will clean out the fuel system and hopefully your catalic converter saving you the additional cost. I have now done this twice to my 2.4 liter nissan with two months inbetween applications

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Are you running regular gas or not you should be running special unleaded fuel

Posted on Jul 01, 2009

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1 Answer

How do I tune it up?


Oil Change & Filter
Transmission Fluid Change & Filter
Fuel filter
Air Filter
Plugs, wires/boots, cap & rotor if applicable
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2004 nissan xterra run great for 12 miles then misfiring,cnt get over 45 miles an hour. codes p 0733,p0420,p0430,p0328 comes up. new wires,new cap,rotor spark plugs 6 months old timming belt 6 months...


code p0733 refers to gear 3 -incorrect ration===causes---wiring---TR sensor/switch--shift solenoids---transmission mechanical fault
code p0420 refers to catalytic converter system -bank 1---efficiency below threshold===causes--cat converter--wiring--HO2s 2
code po430 refers to cat converter system bank 2--efficiency below threshold===causes--cat converter--wiring ---HO2s 2
code p0328 refers to knock sensor (KS) 1 bank 1--high input===causes--wiring short to positive--KS incorrectly tightened--KS---ECM

basically replace the cat converters as they are blocking the exhaust system and preventing your over 45mph problem
replace the TR sensor/ switch as you have not mentioned a transmission problem
Rectify the problem with the KS as it controls the air/fuel mixture setting which contributes to the car getting hot.

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1999 Chevy G-30 utility van code p-0174 , cleaned then replaced MAFcleared code, back on 50 miles later, found vacum leak hose off vac. ball, code cleard 50 miles light back on,


what size engine do you have in the g-30 van. is it the plastic plenum. if it is there are rubber o-ring seals that go bad all the time and will cause the p0171,p0174,p0172,p0175 these are all lean codes also check for fuel pressure to make sure it is up to specs.
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you could have a bad MAF sensor...try unplugging it and driving it around and see what happens. also make sure airfilter is clean. check fuel pressure if above does not work! the fuel cut valve may be the culprit. if it is the maf sensor, you can go to any auto parts store and buy a can of maf sensor spray to clean it. just follow directions on can. do not hit center of maf sensor with the straw on spray can, for these buggers cost over 100.00 new. unless you get one from e-bay or a junk yard. good-day! and check all vacuum lines good.

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1997 GMC S-15 Jimmy 4.3L with OBD-II has p0420 code. Have replaced all 3 Oxygen sensors, MAF, MAP, Sparkplugs, Cap/Rotor, fuel filter, thermostat, and both temp sensors. Cat Convertor replaced before...


have you tried cleaning your throttle body you get this service from wal-mart use valvoline not gum out before you replace all those parts because they can impersonate problems but not actually the problem alot of times or get a can of carb cleaner and a budy and clean it out that way if you know how otherwise go to walmart $18.00 bucks or if you havent replaced mass air flow sensor get electrical cleaner clean the wires but not the cicuit board if you did replace the mass aair flow sensor it could be bad some aftermarkets just dont work well i would check your m.a.f.s. first make sure it is operating correctly then go with cleaning the simplest things 90 % of the time is the problem intead of something major

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2000 GMC Jimmy. OBD2 code P0171. Whats wrong?


system too lean(bank 1). the maff sensor may be dirty or bad. to clean it , remove from vehicle and go to any auto parts store and buy a can of maff sensor spray. be very carefull not to touch inside of sensor, the best way to do it is to place on a clean rag and then clean it. put back on car when dry. this usually does the trick. Inspect all vacuum lines and the vacuum line from pcv valve. also make sure airfilter is clean and free of dust. if above does not solve problem, check fuel filter. hope this helps, follow directions on can to clean maff sensor.

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Having problem with check engine light its showing that theirs a lean on bank 2 code P0174/P0171 what would be the cause could it be my cadaylac converter


what this codes indicates is you are running lean on both sides of the motor 171 is right side and 174 is left side.

Lean means either low fuel pressure or big vacuum leak. Since you have no cylinder misfires I would inspect the MAF sensor first. If you installed a K/N filter the oil on it could of contaminated the MAF sensor fine wires. Or you may have a air filter that is clogged.
You can clean the MAF with brake clean being careful not to break the wires.
Or inspect for a large vacuum leak that could affect both sides.
Or if all else fails have the fuel pressure checked.

14.7.1 part air to 1 part fuel is what the computer tries to maintain
.It needs this to get the best bang for the buck

A big vacuum leak or low fuel pressure will change this
If the computer sees a big vacuum leak it will add fuel until it cant anymore. This is when the code sets.
Same thing for low pressure. It will set the code because the engine stays lean for too long.

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1994 FORD 5.0 BUCKS UNDER A LOAD


I had a similar problem with my 1999 E150 Van. After changing plugs and wires didn't solve the problem, my service technician said it was a problem with the automatic transmission. That was hooey! (technical term :-) In my case, the service engine light came on. I don't remember the exact codes, but they pointed me to 2 problems. 1) Misfire on #4. 2) O2 sensor error.

I researched the O2 sensor problem and found out that it was probably caused by a dirty Max Air Flow (MAF) sensor. On my van, the sensor is accessible by taking out the air filter. It's a very fine wire just beyond the filter. Spraying the MAF sensor with some electrical contact cleaner solved the bucking problem. (CRC brand electrical contact cleaner available at Wal-Mart for about 3 bucks)

Hope this helps.

-- Wes Byers (wcbyers)

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