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Discussion Starter · #1 ·
hello all experts, need your help
SXT 3.7L 2008
1 month ago I had code P0300 (misfire), replaced all spark plags, replaced intake seals, and solved the problem.
Now again I have code 300 and code P1129, same symptoms, engine hesitate at low REP , I removed the intake manifold and sow some engine oil around the seals, how can engine oil get to the intake manifold, and what could be the problem ?
Need some more info on OBD code 1129
I have some problem with one of the Lamda oxygen sensors , code 152 & 158, don't know if it's related.

Tnx
Ilan
 

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You probably have a bad O2 sensor. The computer is not closing the fuel loop. The fuel map is off and probably causing miss fires.

Is your temp gauge right in the middle at normal operating temperature? Make sure electric fan is turning too.

Primary causes are
Fuel delivery system
Engine Coolant Temperature (ECT) sensor or wiring connectors
MAP sensor or wiring connectors
O2 sensor wiring or connectors Engine mechanical system

Read more: https://www.autocodes.com/p1129_dodge.html
 
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