When my Dodge cargo van tested high on Nitrous Oxide, I couldn't find
any OBD computer codes to explain it. I took it to a mechanic who
replaced the O sensor and catalytic converter. I think it was the
catalytic converter that fixed the problem rather than the O sensor
which wasn't very old at the time.
C. E. White wrote:
Check your EGR valve for correct operation, all related vacuum lines
and EGR solenoid and vacuum regulator if equipped. There also might be
two 1/4" metal tubes coming from your exhaust and egr feed lines for
backpressure sensing. Sometimes they rot and break off.
Normally an EGR system problem. You need to have the ECM
scanned for any fault codes. Problem could be bad EGR
valve, EVP sensor, plugged tube, vacuum leak or other
problems. You also need to make sure the ignition timing is
correct. Some parts stores like Autozone will scan it for
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