Lambda vikako?

[vepele]

VM:1994 ZJ 5,2L V-8.
Tumppaa pakoputkesta välillä mustaa,ku dieseli konsanaan,vaikk onkii bensa käyttönen.Näyttää ihan uskomattomii kulutuslukemii sillontällön,varmaankin just sillo ku savuttaa saakelist.
Vikakoodii näyttää nro 51 ja 52.
Mitä nuolie Suomen kielell tarkottaa?

51 Oxygen sensor stuck at lean position (this may be tripped by a bad MAP sensor system causing a rich condition. If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.
OR
51 Internal logic module fault ('84 turbo only).
52 Oxygen sensor stuck at rich position
OR
52 Internal logic module fault ('84 turbo only)