1998 Saturn SW2 AutomaticFACTORY OEM SERVICE PROCEDURE

Exhaust System Check

  1. If powertrain OBD system check has been performed, go to next step. If powertrain OBD system check has not been performed, perform powertrain OBD system check. See POWERTRAIN OBD SYSTEM CHECK in TESTS W/CODES article.
  2. Remove heated oxygen sensor. Install exhaust backpressure tester in place of oxygen sensor. Start engine and let idle. If pressure reading is not 1.25 psi or greater on all models except 2.4L engine, or .5 psi or greater on 2.4L engine, go to next step. If pressure reading is 1.25 psi or greater on all models except 2.4L engine, or .5 psi or greater on 2.4L engine, go to step 4).
  3. Increase engine speed to 2000 RPM (3000 RPM on 2.4L). If pressure reading is greater than 3 psi on all models except 2.4L engine, or .75 psi or greater on 2.4L engine, go to next step. If pressure reading is not greater than 3 psi on all models except 2.4L engine, or .75 psi or greater on 2.4L engine, go to step 6).
  4. Check exhaust system for crushed pipe, internal muffler damage or heat distress. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step 6).
  5. Replace catalytic converter and go to next step.
  6. Operate vehicle within conditions under which original symptom was noted. If system operate properly, system is okay at this time. If system does not operate properly, go to step 2).
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.