What do you when get engine code340 and 341 for camshaft position sensor there is no such thing on a 1998 Saturn SL2?

You're right, a 1998 Saturn SL2 doesn't have separate camshaft position (CMP) sensors in the same way many other engines do. Instead, it likely uses a Crankshaft Position Sensor (CKP) and the Engine Control Module (ECM) interprets the crankshaft signal to determine camshaft position indirectly. Codes P0340 and P0341 (assuming these are OBD-II codes, the "340" and "341" might be manufacturer-specific) usually *refer* to camshaft position sensor issues, but their application on a 1998 Saturn SL2 needs further investigation.

Since there's no dedicated CMP sensor, these codes are likely pointing to a problem indirectly affecting camshaft position sensing. Here's a troubleshooting path:

1. Verify the Codes: Double-check the codes using an OBD-II scanner. Ensure they're accurately read. Some scanners might misinterpret signals or use generic codes that don't exactly match the Saturn's system.

2. Crankshaft Position Sensor (CKP): This is the prime suspect. A faulty CKP sensor will prevent accurate crankshaft position reading, leading to incorrect camshaft timing calculations by the ECM and throwing those codes. Inspect the CKP sensor for damage, corrosion, or loose wiring. Consider replacing it.

3. Wiring and Connections: Carefully examine the wiring harness related to the crankshaft sensor. Look for broken wires, corrosion, loose connections, or any signs of damage. Pay special attention to the connectors. A bad connection can give false readings.

4. ECM (Engine Control Module): In rare cases, a faulty ECM can misinterpret the CKP signal and generate these codes. This is less likely but should be considered if other components check out. ECM diagnostics usually require specialized equipment.

5. Engine Timing: A significant problem with the engine timing (e.g., a jumped timing belt or chain) will severely affect the relationship between crankshaft and camshaft position. Check the timing belt/chain for proper alignment; this often requires professional-level tools and knowledge.

6. Variable Valve Timing (VVT) System (if equipped): If the SL2 has a VVT system, malfunctions there can also trigger codes related to camshaft timing. Inspect the VVT components according to the repair manual.

Important Notes:

* Repair Manual: A repair manual specific to your 1998 Saturn SL2 is crucial. It will show the location of the crankshaft position sensor, the wiring diagrams, and the proper diagnostic procedures.

* OBD-II Scanner: A good quality OBD-II scanner will provide more detailed information than a basic code reader.

* Professional Help: If you're not comfortable working on your car's engine system, it's best to take it to a qualified mechanic. Incorrect timing adjustments can cause serious engine damage.

The codes are a symptom; the underlying problem needs to be found. Focusing on the CKP sensor and its associated wiring is the logical starting point, given the car's design.