I have a 1998 VW Beetle 2.0 which just last week I changed the Cat Converter, 02 sensors and installed new plugs and wires because my check engine light was on. After I did all that, the check engine light was off for 2 days and now its back on. I took it to Autozone to have them run the computer check and the following codes came up. P0171, P0300 and P0303. Could anyone tell me what could be the problem now. Your help is greatly appreciated.
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Re: Check Engine Light see codes below
P0171 is LEAN and P0303 is misfire number 3 cyl. Its time to stop guessing and pay for a correct diagnosis. Find a shop that works on VW and has the tools to work on it. DO NOT put those Bosch Platinum Spark plugs in that Ottozone tries to sell everybody.
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The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensorwaveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
Most likely, the aftermarket cat they installed is a high flow cat. This commonly causes issues with throwing that code on our cars. You can either have an OE cat installed, or just have the code deleted from the PCM by someone that has a tuner. Good Luck
code P1133 is for a problem with 02 sensor bank one sensor one. this is the left 02 sensor in front of the cat. converter. code P1153 is for a problem with 02 sensor bank 2 sensor 1, which is located on the right side of engine in front of the cat. converter
Manual can not tell you the problem relaited to check engine light . I mean point the problem . You have to use scaner to retreive the code from ECU and go from there. You could save a lot of money by retreiving code from ECU in the first place , instead of doing guesswork.
If you don't have poor gas milage and loss of power, the cat is not restricted and not at fault, however, an engine misfire can also trigger that code.
Change the 02 sensor down by the cat first,( it's cheaper than a cat), see if that clears the code, if not, then go for the cat. You will already have a new 02 sensor, so that will eliminate those two. Hope this helped.
Huge problems with these cars. The Pre-cat converter is built into the exhaust manifold. Expensive to replace. No Recall on this item. Some say that inferior compounds in the catalyst cause corrosion and early wear of the piston rings. I have seen one of these use 5 qts of oil in 300 miles. Is this car using excess oil?
The exhaust system has two 02 sensors One before the cat converter and one after. The #2 02 behind the cat converter is the one that trips the light if emmisions are unacceptable coming out of the converter. The #1 or front 02 sensor monitors and constantly adjusts the fuel to stay within parameters. If the #2 tries to compensate for an inefficient converter and it conflicts with the #1 02, the ebgine will run poorly due to either too rich or too lean fuel adjustment. Have the #2 02 sensor replaced and the converter checked. Good luck
If your catalytic converter is "below efficiency" or otherwise clogged, you will lose power as you drive and the vehicle heats. The more you drive the vehicle, the worse the problem will become. The exhaust can't escape properly through the catalytic converter, therefore your engine won't run properly. Your issues are related, and if you replace your catalytic converter they should go away.
No need to replace the MAF. If it was bad, the check engine light would have come right back on as soon as you started the engine. The MAF not only measures the air going into the engine, but also measures the air temperature. Those 2 circuits are constantly sending info the the ECU. If either would fail, the ECU would light the check engine light. P0171 is a common code for incorrect readings (dirty) in the MAF. Cleaning it always helps, and cuts off the light. Your acceleration problem may be either a wrong Air-Fuel sensor (the one before the cat), or an "aftermarket" AF sensor. "Aftermarket" AF sensors have been shown to not work properly in Toyota vehicles. Hope this helps