You didn't say what the make and model are, but if code 43 is a knock sensor issue I guess its a GM product.
Code 21 means the TPS voltage was too high, and code 43 means the knock sensor voltage was too high or too low.
Neither code would kill the engine. Just turn the warning light on.
If the throttle position sensor failed, you would get the effect of stalling on acceleration.
You may need to narrow down the possible causes to spark or fuel, and in the end it could be the engine computer. It could also be a relay or other electrical component.
I ended up solving problems with the codes. The new TPS was faulty, and the KN senser was bad. The problem ended up being a plugged cat. I pulled the exhaust off the motor. Thanks again guys for all your help
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SOURCE: check engine light code 15 on 91 honda accord dies while driving
Have come across this before and have only had to replace any parts a couple of times. What I have found to be the problem in about half the cases was that there was a poor connection in the connector at the right shock tower. Also in about 30 percent of the case I have found an open wire that was just old and as it got hotter would lose it's continuity. Below is a picture of one of the connectors at the distributor. When you are having problems check to see if you have battery voltage at the yellow wire by using your negative battery terminal as your ground when checking for voltage and the key needs to be in the "on" position when checking. If voltage is not correct find the open wire. Last but not least, in the other connector at the distributer (see the next picture) where you see the leter "A" or terminal "A" with the key on and using the battery as a ground you should have about 10 volts there. If not correct, replace the ignitor. It may be heating up but as I said this is not common but have seen it before. Remember to check when the problem is happening when checking. Hope this helps.....
SOURCE: 92 lesabre runs 4 minutes and dies
Make sure and check your ignitioin fuse if its out the car will start it just wont stay running verry long sometimes in most cases will turn over but not start
SOURCE: i have a 91 honda accord lx starts fine runs good
It may be the O2 sensor. I know it's not the fuel filter, spark plugs, spark plug wires, Vehicle Speed Sensor, Dis. cap, or TCM.
SOURCE: 91 Jeep wrangler New everything idles rough, no Power then dies
you check for miss how is compression
SOURCE: car will not start change out camshaft sen, crank
maybe a dicky cam sensor even if new! make sure the cam sensor is aligned correctly as if its out even a small amount the car will not run. check it is in place correctly.
Is the car trying to start? or are you getting nothing when turning the key?
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