A Lambda sensor, also known as an Oxygen sensor or O2 sensor, will only last for about 60,000 miles (heated sensor). 30,000 for the non heated sensors. Mileage will be much less than that if it becomes contaminated. The O2 sensor is easily contaminated by Silicone (RTV) and many other chemicals. Only use "silicone free" gasoline additives and anti-seize compounds.
The cost of a new Porsche 3-wire O2 sensor can cost over $200. For about $40, a generic 3-wire BOSCH sensor can be used ($25 for a 1-wire). By reusing the original Porsche connector(s) and wire harness, the new O2 sensor is spliced to the old wire harness. Use 3 crimp-on wire splices and heat shrink tubing is recommended. Never solder joints!
If you use a 13913 generic, the splice point will be closer to the O2 sensor than shown
| Porsche P/N | BOSCH short P/N | Model | Year | Wires | Heated |
| BOSCH long P/N | Replace | ||||
| 944 606 133 00 | 11031 | 944 | 1983 to 1985.0 [49 States] |
1 | No |
| 0 258 001 031 | 30,000 mi | ||||
| 944 606 135 00 | 13001 | 944 | 1983 to 1988 [California] |
3 | Yes |
| 0 258 003 001 | 60,000 mi | ||||
| 944 606 135 02 | 13011 |
944 | 1985.5 to 1988 [49 States] |
3 | Yes |
| 944 | 1989 on | ||||
| 0 258 003 011 | 944S & 944S2 | All | 60,000 mi | ||
| 968 | All | ||||
| 951 606 135 00 | 13012 | 944Turbo (951) | All | 3 | Yes |
| 0 258 003 012 | 60,000 mi |
BOSCH "short" part numbers are used for ordering.
BOSCH "long" part numbers are what is actually stamped into the sensor.
| BOSCH short P/N | Description |
Wires |
Heated |
| BOSCH long P/N | Replace |
||
| 11025 | Universal Replacement
without connector $20 |
1 | No |
| 0 258 001 025 | 30,000 mi | ||
| 11027 | Universal Replacement
without connector $20 |
1 | No |
| 0 258 001 027 | 30,000 mi | ||
| 13913 | Ford, Lincoln & Mercury $40, 8" harness |
3 | Yes |
| 0 258 003 913 | 60,000 mi | ||
| 13953 | Ford $45, 16" harness |
3 | Yes |
| 0 258 003 953 | 60,000 mi |
There has been no BOSCH "Universal Replacement" Lambda sensor for heated sensors. The 13913 is sold in high volume and is used as the universal replacement sensor. It is the lowest priced sensor of the type. I prefer the 13953 which costs more but has a longer wire harness.
BOSCH has introduced a new universal replacement sensor 15725 and is hard to find but can be found at "Paragon". It is about $70. This is a universal replacement for the for the Ford numbers 13913 and 13953. Kit includes 3 Posi-LockÒ air tight connectors. This is not a universal replacement for the original Porsche sensor.
All prices are from April 2002.
Use wire crimps or Posi-LockÒ. All the latest BOSCH O2 sensors are air tight. But the O2 sensor must have a clean air supply to work. It breaths down the center of the multi-stranded wire(s). Solder and solder flux will close the air-gaps between the strands of wire and the O2 sensor may malfunction.