Pt cruiser codes 0401 and 1684

SOURCE: 2005 pt cruiser... it sputters and won't idle well

That is the first thing i would suggest you do. Replace all the spark plugs and the plug wires. Those 2 things are the most commen thing that cause misfires.

SOURCE: DIAGNOSTIC code P01A4 for pt cruiser

I have the same problem. Pt - 2002, 2.2 diesel. Same mistake number appeared. Noone knows what is it.

SOURCE: 2001 PT Cruiser: How too remove crankshaft pulley 2001 PT Cruiser...

GET A 3 SPOKE PULLEY EXTRACTOR AND SCREW IN THE BOLT BUT IN THE CRANKSHAFT HOLE PUT A MUCH SMALLER SCEW SO YOU WOUNT MESS THE INSIDE UP

SOURCE: My 2003 PT cruiser's engine light came on, then

Find your air mass flow sensor in the stiff collar of the air ducting immediately after the air filter. Have the engine running and disconnect the plug to the MAF. If this makes the car run evenly again you need to replace the broken MAF. The misfire on plug 4 I think is a downstream event of the MAF not sending the right info to the ECU and consequently not providing the right fuel / air mix to the engine

SOURCE: PO551 fault code on PT cruiser...power steering??

i would check the power steering fluid to make sure it isn't low. if that checks out then i would just keep an eye on it.